Sewage backup cause, prevention, & response questions & answers:

These questions & answers about sewage spills, sewage leaks & sewage contamination help in deciding what to do about these problems.

This article series explains how to deal with and test for sewage backup contamination, sewage contamination testing, inspection, and cleanup- remediation in residential and commercial buildings. If you have had sewage back up and spill out of toilets into the building, cleanup is needed and you may face bacterial hazards.

Q&A on Tests For Bacterial Contamination & Clean Up Sewage Backup

These questions and answers were posted originally at SEWAGE CONTAMINATION in BUILDINGS - topic home, be sure to see the advice in that article.

In that article series we discuss how to test for bacterial or other pathogens in a building - tests that may be useful after a sewage spill cleanup in order to assure that the building is acceptably clean.

[Click to enlarge any image]

If your building has had a septic or sewage system backup into the structure

see SEWAGE BACKUP, WHAT TO DO

On 2019-02-17 by (mod) -

Apologies but I don't quite understand the question the way you have phrased it. If you have open sewage in your home that's a very serious contamination Hazard.

I don't understand rotting water tanks since water tanks are usually made of steel. It certainly fairly straightforward to disinfect or sanitize a well and water supply system as well as to have it tested for bacteria and other contaminants.

There also are of course procedures for testing the indoor environment and surfaces for sewage contamination.

On 2019-02-17 by Elena

How much, on a norm. Is an exposed sewage pipe containing in bacteria to a in home environment. Or what role does a rotted water tank take place in exposing bacteria

On 2019-04-01 by (mod) - toilet overflow

Sure, Brenda, a qualified enviromental expert can take swab samples and have them analyzed by an appropriate test lab; keep in mind that EVERYTHING depends on exactly how and where the samples are collected so be sure your expert is expert.

Frankly, it's simpler than that. If you had wall to wall carpeting that was soaked with sewage it is not salvageable and is normally thrown out.

Some area rugs can be sanitized and cleaned adequately.

On 2019-04-01 by Brenda

I had a toilet to overflow in my home two years ago causing major damage to my home and to my Furnishings. I want to know if it is possible to detect contamination on furniture and rugs after a two-year period of them being in storage? Thank you.

On 2019-02-17 by (mod) -

Apologies but I don't quite understand the question the way you have phrased it. If you have open sewage in your home that's a very serious contamination Hazard.

I don't understand rotting water tanks since water tanks are usually made of steel. It certainly fairly straightforward to disinfect or sanitize a well and water supply system as well as to have it tested for bacteria and other contaminants.

There also are of course procedures for testing the indoor environment and surfaces for sewage contamination.

On 2019-02-17 by Elena

How much, on a norm. Is an exposed sewage pipe containing in bacteria to a in home environment. Or what role does a rotted water tank take place in exposing bacteria

On 2018-12-07 by (mod) - sewage contaminated wall to wall carpeting

Yes drywall and carpet and padding and similar materials that have been wet with water or sewage cannot be successfully nor safely cleaned - they are removed and the remaining surfaces are disinfected or sanitized.

On 2018-12-06 by Dewet Scott

Please need advise on a leaking toilet pipe behind a dry walling that has leaked through the wall under the Vinal flooring and also onto the carpets in main passage

What is the correct proceedure for the Developer should be taking on cleaning up and sanitising the area ?

Must the walling that has soaked up the water be removed ?

What treatment should be carried out on the concreet floor ?
Many Thanks
SSewa

On 2018-10-24 by (mod) -

Re-Posting from private email:

I had flushed my 38 gallon black water tank then filled and drained it. I decided to fill / flush and drain it again. The toilet overflowed with dirty water, no solids. I immediately shut the water off and put rags on the floor. The walls were not penetrated and just the edge of the carpet.

Once the water was removed with rags I wipe all area with lysol three times. When we got home the carpets were cleaned (only the edged was wet) and re-cleansed the floors. Since I had rinsed the 38 gallon black water tank twice their was never a smell and the water was removed and floor cleaned quickly.

I have worked in water, wastewater and biosolid plants all my life.

What is your opinion? - Anonymous FJ by private email


Moderator Reply:

OPINION: I think if water never got into the bottom of your walls that's very lucky. I suspect also that it's impossible to completely disinfect carpet that has been wet with black water or sewage.

That's why insurance companies normally replace it. However if only a very tiny amount of an inch or so of the edge of a carpet was wet I can understand the temptation to try leaving it in place.

On 2019-02-14 by (mod) -

Apologies but I'm unsure what you mean by

Cavity drsinage membrane

Perhaps you can add an image

On 2019-02-14 by Jay

I recently had a sewage leak that went into my newly converted basement. We are replacing all of the porous materials such as wood, floor boards and plasterboards.

Cleaning up and disinfecting all the areas affected. However, I wanted to find out whether it would be acceptable to simply disinfect the cavity drainage membrane or is it required to also disinfect underneath the membrane. I wouldn’t want the waterproofing system in place to be damaged. No one is going to come to contact with underneath the membrane due to it being placed onto earth, does this make a difference?

Can the membrane be left as it is but cleaned thoroughly on the top (ie the room side)?

On 2019-01-20 by (mod) - sewage backup soaked oriental rug

Renee

That sounds reasonable; you need an adequate concentration of disinfectant and sufficient exposure time and penetration of any cracks and crevices such as between a caster or foot and the bottom of a chair or bench leg followed by cleaning and drying to avoid damage.

It MIGHT be also possible to have your carpet professionally cleaned and disinfected. Otherwise it's history. (and trash).

The more serious concern that you don't mention is the risk that sewage waters penetrated the lower portion of building walls and underneath built-in cabinets -areas that need to be explored and probably opened and cleaned and disinfected.

If you ignore those areas your risk a more-costly mold and bacterial contamination problem later.

On 2019-01-20 by Renee

Here is a pic of the sewage flood. I am hoping that I can sanitize the "feet" of hardwood furniture, particularly of antique pieces that are unique and not easily replaceable, as well as the soles of shoes and boots that were in the sewage.

We had a sewage backup of 1-2 inches in our house that was professionally cleaned. Can we clean and salvage hardwood furniture and shoes, with soles made of leather, rubber and other materials? If so, how? In a solution of bleach and water? Thanks!

On 2019-01-10 by (mod) - sewage hazards from outdoor spills

John

I agree that it would be a likely health hazard to track sewage contaminants indoors.

Check with your local health department.

On 2019-01-10 by John

I live in a rented townhouse. After having a broken clean-out line repaired (due to root intrusion) a day later I noticed my next door neighbors clean out line (10-12 ft away and under a hedge) was, not only uncapped (?), but was spewing raw sewage.

I alerted my neighbor (a renter as well) and he did nothing about it. I alerted the HOA management company via email.

No response after three attempts. 10 days later, I luckily got a hold of the HOA contact who admittedly dropped the ball. Meanwhile the mess expanded and mushrooms were growing. God knows how long this had been going on. They sent a plumber to fix it. My concern is how long will that soil (thick adobe clay) be contaminated.

Does mother nature clean it up?

Keep in mind, two days after the incident, I found myself feeling unusually nauseated.

Trust me, this wasn't psychosomatic. Caught totally off guard, I found myself throwing up in the middle of the night. Coincidental?

Unbeknownst to me, I had been tracking mud on my shoes after they displaced the soil to repair our broken line.

On 2019-01-06 by (mod) - condo toilet overflow at neighbor

Drying out the floor and replacing drywall PLUS disinfection of ALL of the affected surfaces MIGHT have been adequate, depending on the speed of the response and its thoroughness. If someone left wet materials in the walls you are inviting a mold problem. If sewage-treated surfaces were not disinfected there are likely to be remaining health hazards.

Just whom you can talk with depends on where you live: start with a call to your local health department to ask for advice.

On 2019-01-03 by Betty

The toilet of a Condo unit next to mine overflowed and flooded my unit. The Condo association came in with fans and dried out the floor. They replaced about 1foot of drywall along the wall from where the sewer water came in. Within a couple of days they had replaced the drywall.I have no way of knowing if they did proper sewer clean up. Is there some one who can do a contamination test? Is there any Government agency who I could speak to? Thanks!

On 2018-10-24 by (mod) - The toilet overflowed with dirty water

Re-Posting from private email:

I had flushed my 38 gallon black water tank then filled and drained it. I decided to fill / flush and drain it again. The toilet overflowed with dirty water, no solids. I immediately shut the water off and put rags on the floor.

The walls were not penetrated and just the edge of the carpet. Once the water was removed with rags I wipe all area with lysol three times.

When we got home the carpets were cleaned (only the edged was wet) and re-cleansed the floors. Since I had rinsed the 38 gallon black water tank twice their was never a smell and the water was removed and floor cleaned quickly.

I have worked in water, wastewater and biosolid plants all my life.

What is your opinion? - Anonymous FJ by private email

Moderator Reply:

OPINION: I think if water never got into the bottom of your walls that's very lucky. I suspect also that it's impossible to completely disinfect carpet that has been wet with black water or sewage.

That's why insurance companies normally replace it. However if only a very tiny amount of an inch or so of the edge of a carpet was wet I can understand the temptation to try leaving it in place.

On 2018-08-26 by (mod) -

Joey:

such material needs to be removed, disposed-of, and the exposed surfaces cleaned and sanitized.

On 2018-08-23 by Joey

What is the appropriate procedure for decontaminating fire proofing material that was wet from a sewer leak?

On 2018-02-22 by (mod) -

Bed

In the article SEWAGE CONTAMINATION in BUILDINGS

see "Testing for Sewage or Septic Contamination" and below that

I've added a heading titled

How are Sewage Contamination Tests Conducted?

to help you find the description of how one goes about testing for sewage contamination. Please take a look and don't hesitate to ask if you need more information.

You may need to refresh your browser cache to see the updated page.

On 2018-02-22 by bedborough

our offices have a leak from residential flat above us. How can we go about testing for contamination

On 2017-08-27 by Manikandan

Thanks
But not clearly explained how it happened

On 2017-08-08 by Joe

Queens, NYC. After heavy fast rain, sewer trap cap came off and sewer waste came into entire basement of my 2 family home about 2 - 3 inches worth.

Before I can pump out it dissipated and then I wet vacced the rest. I worked with gloves and boots and mask. My wife is also pregnant. Are we stupid?

The neighbors (all attached) got some water also but it was clear water for them. I threw out most stuff and cut sheet rock off bottom 18" and took photos.

I never called insurance company because it clearly says on my policy NO water back up insurance. What else to do? I am nervous because I have an illegal basement.
Help.
Thanks..

On 2017-06-30 by (mod) -

Mark,

While accuracy and truth have become a weak commodity these days, I still have to say that truthfully, I can't assess the need to remove tile by e-text.

Steam cleaning will not disinfect deeply into floor tiles (nor much of anything else) though it can clean the floor surface. That's because steam temperatures will not be able to remain high enough nor penetrate deeply enough to disinfect beyond the surface of most materials.

In general you'd expect the sewage-contaminated floor to be thoroughly cleaned, sanitized / disinfected, then swab-tested to confirm that it is not giving up bacteria or other pathogens from the sewage spill. A fancier test might include wetting the cleaned floor with sterile water and after that sits a bit, swab-testing that as well.

Tests and inspections of the work must be performed by someone completely independent from the cleaning contractor.

If the tiles are securely in place, no sewage odors remain, and the floor was disinfected and tested to show it's sanitary, I don't see a justification for going further.

However I'd be very concerned if the sewage backup that spread into your four rooms seeped into the bottom of wall cavities. If nobody pulled off baseboard trim, drywall, etc. to check and clean those areas, problems could remain with both sewage contaminants and perhaps mold contamination too.

On 2017-06-30 by Mark

We had a sewage back-up that spread to 4 rooms. We have a type of Mexican pavers, called Saltillo tile on the floor, which does not have a glaze and is fired at a low temp. As a result it very porous according to the internet. It took 3 weeks to dry the rooms enough to pass inspection. The spill is the responsibility of a contractor. He just wants to steam clean. Should the tile be removed?

On 2017-01-03 by (mod) -

You may get free advice from your local health department,
OR
You may be able to get a copy of tests and inspections performed by the independet expert hired by the cleanup company how did the sewage backup cleanup
OR

OR paid inspection and testing by an industrial hygienist or other indoor environmental wxpert whom you hire from your local area.

At any inspectapedia.com page top you will find a menu of links from which you should choose EXPERTS DIRECTORY to find an expert who may offer what you need.

Typically the professional will review the case history, inspect the areas where the sewage backup occurred, and the extent of work, followed by an inspection of other areas of the building. Typically swab tests are taken to allow a check for unacceptable levels of bacteria left on representative Building Services. Of course you're on site expert will have her own opinions about exactly what needs to be done.


 (18 hours ago) Jammel said:
I live in Inkster, MI
 (18 hours ago) Jammel said:
Who do I call to come test my home to make sure it was cleaned well & it's Hazmat free after a septic backup?

On 2018-11-18 by (mod) - hazards of sewage

KB

The hazards of sewage are given in đetail at SEWAGE CONTAMINATION in BUILDINGS.

On 2018-11-17 by KB

My neighbor busted a sewer last summer while digging in his yard. They still haven’t gotten it fixed and often times the smell is really bad. Is this dangerous? It’s very close to my yard

On 2018-09-30 by (mod) - trailer with a sewage system leak i

Deborah

This is indeed a troublesome topic. Your rental contract and laws where you live determine who is responsible for fixing an unsafe, unsantiary, or otherwise not-working septic system. You may get some help by asking your local health department for assistance.

On 2018-09-30 0 by Deborah

I rent a trailer with a sewage system leak in the outside of it told my landlord and he doesn't do nothing about it

On 2018-09-24 by (mod) - sewage smell when running washer

I'd like to help but I can't give a very confident answer on a complex question for a property about which essentially I know so little.

However if there was in fact sewage under your mobile home and the area was never cleaned and sanitized there could be health risks remaining

On 2018-09-22 by Donna

We live in a mobile home, which we own but not the land. We had alot of problems with grease backing up our pipes, from previous owners.

We had plumbers out several times and had fixed it, then one time they came out and pumped our septic tank which was very close to our home(like maybe 50 ft.)

And the plumbers told us the tree roots were caving the septic in, so they left a drain in that overflowed into our yard and under the house. For 3 years we tried to get the land owner to fix it and the smell was awful.

He finally replaced it about 2-3 years ago, but I have been thinking since there was no clean up are we still at risk of any health issues.

Sometimes I still smell it when running water in the house, like the washer. What should I do or should we be worried

On 2018-08-19 by mrs.rddriver01 by Rachel

My basement is backed up due to the septic tank being full, we have had small black Nat/Flies in our home every since, i am worried about parasites can it be possible? Could we get a parasite from this? We honestly feel like we are going crazy!! We feel like bugs are crawling all over us but didnt see anything, we are getting bit and itching like crazy!!

At first we felt bugs crawling from head to toe but couldn't see anything!! Later i went to change the sheets on our beds and this is where it gets interesting!! We found bugs in ALL of our beds!! They looked like worms or sticks or fabric, very small, but they were moving!! They were weaving through the threads of our beds, I am disgusted!! We have thrown out ALL of our beds and ALL furniture, we are now staying in a hotel!

Every single time we return home we itch and get drove crazy!! Just a little further explanation: The bites or borrows on our skin look like there is a black dot and in some red dots, it feels like bugs are in our skin from scalp to bottom of feet we are completely disgusted!! My husband has a brown squiggly thing in his eye PLEASE HELP!!?? Are we crazy or can this REALLY happen and if so how? What kind of parasite and how does it get on us?

On 2018-07-09 by Kathy

Parents had sewage backup in crawl space and were unaware for approx 5-6 was buildup of approx 2-4 inches of sludge in a corner part of crawl space.

Cleanup crew was called in and environmental tests done. All clear But smell lingers. Smells like a washing machine that’s been closed up for a while or a damp smelly carpet?

Asked the cleanup crew back they can smell it but they don’t know why? Any ideas? I’m thinking the smell from initial backup has permeated into walls, furniture, etc. Some of the sewage was dry and growing

On 2018-06-27 by (mod) - sewage risks contaminating your vegetables and tracking pathogens on your feet into your home.

Anon

Yes sewage risks contaminating your vegetables and tracking pathogens on your feet into your home.

What you describe is not just disgusting and mean on your neighbor's part, it is unsanitary, unhealthy, and in most countries and jurisdictions, illegal. If your neighbor isn't going to stop this practice of literally pooping on his neighbors, you need to ask for help from your health department.

On 2018-06-27 1 by Anonymous

I have a neighbor that is pumping his sump pump out to the property line and it empties out on my yard, it has left dark spots where his pump has been. If this is sueage will it contaminate my veggies I grow and will it be a harm walking on it?

On 2018-06-11 by (mod) - sewage smell in apartment in Pearl City Hawaii

Sounds like you need a plumber or home inspector loan site to start with a visual inspection to find candidates for the source of the odor that you described.

On 2018-06-10 by Brandee

I rent a studio apartment in pearl city hawaii. I love my apartment the park is literally my back yard. About a week after moving we noticed a horrible smell that would come and the wind so to speak.

We didn't think anything about because it wasn't all the time just every once in awhile. Some old plumbing sensative like that especially in Hawaii.

Then about a month went by and the smell kept getting worse and worse I pretty much figured out that the smell was coming from my bed room window like right out side my window and my window is right were I lay my head down.

The smell is so bad wakes me from sleep so I grout to

On 2018-02-06 by (mod) - have a proper sewage spill cleanup done

You should have a proper cleanup done - if nothing else to remove physical debris and disinfect or sanitize the exposed surfaces, assuming those are solid masonry. If sewage leaked into wood framed or steel framed walls covered with plaster or drywall there may be other cleanup needed.

On 2018-02-06 by Rachelle Boyle

I've had a sewage leak in my garage from block of flats above, this was around 3/5 years ago and I haven't touched it since, would it be OK now or do I still have to clean up?

Garage has no lights either it's quite dark in there, thanks

On 2018-01-25 by (mod) -

Jamie

Check with your doctor for health advice.

You or the property owner need diagnostic help from a plumber or septic inspector to determine the cause of backups and thus what repair is needed, ranging from a blocked line to a damaged and non-functioning septic system that may be unsanitary.

A claim that old houses always back up if you wash clothes, dishes, and shower at the same time is in essence true IF the old house has an inadequate or failed septic system, otherwise it's in my opinion pure baloney.

On 2018-01-24 by Jamie holder

Please help we have no idea what to do we found a pipe out by a building that apparently the sewage drains there??? I have been severely I'll on and off since we moved into this home chronic sinusitis and severe stomach problems now my husband is sick please help we don't have a clue as to what we should do we contacted the landlord and he said that old houses had sewage back ups when you washed clothes and dishes and showered all at the same time???

On 2018-01-24 by Jamie holder

The house we rent has well water our septic system has backed up two times in the past month there was about three inches of soiled water from the toilets backing up and the bathroom sink my husband and myself have been very I'll the past week with severe headaches stomach pain diarrhea and many other things

On 2017-06-23 by Kimberly

I had sewage back up into the bathroom and that water was draining through the floor into the garage below. Cleanup company says they will encapsulate the wood from the bottom and there is no reason to pull up tile. I'm concerned about contaminants being trapped between the tile and subfloor. Structure was built in the 30s. What do you think should be done? Thanks.

On 2017-06-10 by (mod) -

Be sure to review: SEWAGE BACKUP, WHAT TO DO at https://inspectapedia.com/septic/Septic_Backup_Response.php

On 2017-06-10 by (mod) -

Laurie,

The home may indeed be unsanitary and thus unsafe to occupy until it is properly cleaned and disinfected.

I can't say exactly what were the plumbing company's responsibilities, but my OPINION (I'm not a lawyer) is that if your sister hired someone to clean up a sewage spill the contractor is responsible for doing the job properly.

Beware that it's possible that the original cleanup was done correctly - there could have been a second sewage spill if the cause of the backup wasn't properly diagnosed and corrected.

However it sounds inadequate as you don't mention use of a sanitizer nor putting down of a plastic barrier over the dirt in the crawl area nor any tests to be sure the living area is sanitary.

On 2017-06-10 16:27:26.259817 by Laurie

My sister's home had a sewage pipe repaired in her crawl space 4 years ago. The plumbing company explained that they would clean up and take about 1" of dirt out. There has been drought in the area until this year. This year there have been heavy rains. My sister started having the feeling of crawling on her and strange immune responses. We have been looking for mold in the house. An inspector went in the crawl space and found that human sewage waste was never cleaned up and it was re-moistened during the heavy rains this year. Can old sewage that is remoistened cause a health hazard? Is it generally the plumbing company that cleans up the waste left from a sewage leak as part of the repair?

On 2017-04-25 22:21:30.211026 by (mod) -

Dawn

My sympathies for the terrible experience you had in your "new" but not so nice-sounding home.

Indeed a sewage backup, if not properly cleaned-up, can leave various pathogens such as bacterial and viral hazards in a building as well as its water leading to both visible and hidden mold contamination.

It's not, however entirely the case that your contents in the home are entirely beyond salvage. Many items, particularly hard-surfaced items (wood furniture, china, glassware, most plastic items can be professionally disinfected and cleaned reliably. Clothing and bedding can generally be laundered, disinfected, or drycleaned.

What is usually beyond economic salvage are thick soft goods such as wall-to-wall carpeting, mattresses, pillows, and some other items of any material may be so inexpensive to replace as to cost less to replace than to clean.

However in my OPINION your first actions need to be guided by your doctor - appropriate medical diagnosis and treatment.

A second priority is to get professional help in deciding what contents of the home are economically salvageable. Wholesale abandonment of everything in a home that was contaminated by sewage or mold seems to me a bit rash.

Your attorney can let you know if you should have any financial relief-recourse.

Generally buying real estate is a famously "caveat-emptor" transaction, and the buyer is expected to do their own due diligence, and sellers and realtors are rather excused from most disclosures for various reasons, some of them quite sensible: a realtor won't know the whole history of a home and depends on information provided by a seller.

Unfortunately these protections can also become a license to fail to disclose facts that were actually known; still, some states have a home disclosure law that requires certain known-information to be revealed to a buyer.

Keep me posted.

On 2017-04-25 22:04:32.750990 by Dawn McGregor

We bought a house had it inspected just to almost die in it.after a year in this house we all had gotten very sick, me very deathly sick .so someone mentioned mold but we never seen any mold but was having alot of unexplained health problems. So we talked to a neighbor who was sorry to hear how sicken I became and I ask if anyone was ever sick when the previous owners had it.

i was then told he wasn't sure if they were sick but recalls a chilling SEWER line rupture and the house took all the unpacked because it sat lower then the other houses surrounding it.and the yard and hillside behind the house flooded to..we were never aware of this problem sellers didn't disclose. We then had the house tested for mold and high levels of toxic molds..

we left the home with me on my death bed and no diagnosis, but plenty of UTI infections and diverticulitis and also c diff.a long line of ongoing stomach pains ,

we been out and house is up for sheriff sale through quicken loans who are foreclosing the property and all our belongings because we can't take anything from there.do to cross contamination,

but my husband and father in law went down a few weeks ago and I think since the house has been sitting and still sewer contaminated got worse ,because now we all have bacteria infections, bacteria meningitis, respiratory infection and ring worm and my husband has a fungus infection,

I can't tell you how lost we are ,sewer contaminate and toxic molds and lost our new home our belongings ,money ,jobs,cars health and still sick I think somehow we are now renting a house that has become cross contamination. And we don't know what to do

...

Continue reading  at SEWAGE CONTAMINATION in BUILDINGS - topic home, or select a topic from the closely-related articles below, or see the complete ARTICLE INDEX.

Or see these

Sewage Contamination Articles

• HEALTH DEPARTMENT HELP for RENTERS if your rental home has unsanitary or unsafe conditions that are not being addressed properly
• SALVAGE BUILDING CONTENTS
• SEWAGE & SEPTIC CONTAMINANTS


• SEWAGE BACKUP, WHAT TO DO
• SEWAGE CONTAMINATION in BUILDINGS
• SEWAGE CONTAMINATION TEST
  • SEWAGE CONTAMINANTS in FRUIT / VEGETABLES
  • SEWAGE NITROGEN CONTAMINANTS
  • SEWAGE PATHOGENS in SEPTIC SLUDGE
• Step 6. FLOOD DAMAGED BUILDING CLEAN-UP if you need general guidance following a flood

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SEWAGE CONTAMINATION FAQs-2 at InspectApedia.com - online encyclopedia of building & environmental inspection, testing, diagnosis, repair, & problem prevention advice.

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INDEX to RELATED ARTICLES: ARTICLE INDEX to DRAIN SEPTIC SEWER PIPES

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