Easy Guide to Inspection & Testing When Buying a Home With a Septic Tank
POST a QUESTION or COMMENT about septic test procedures & tank pumping when buying a home with a private septic system
Buying a home? when to pump the septic tank: this document provides advice for home buyers who are buying a property with a private septic system,
that is, a septic tank and a leach field or drainfield or similar soil absorption system.
Chapter 5 in this file describes detail:
questions to ask about the septic system, how to perform the visual septic inspection,
ordering the loading and septic dye test (the too-obvious results of a dye test at a problem site are in the photo ), pumping the septic tank, and
finding additional information about the septic system.
We explain how to be sure your septic inspection and septic test are conducted properly.
We tell you where to get more septic system information about a given property,
and we warn of unsanitary or dangerous site conditions.
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5-4. PUMP THE SEPTIC TANK When & How to Pump the Septic Tank When Buying a Home
After performing the septic loading and dye test and obtaining
whatever historical maintenance and repair information you can obtain from the prior owner,
you may want a septic
contractor to located, open, pump, and inspect the septic tank.
The decision to include
this next and more invasive step depends on what you have already learned about the
age, history, and probable condition of the system. The pumping decision should be advised by
the visual inspection, site history, and loading/dye test results.
Warning: [Repeated from the Dye Test discussion]
Do not pump the septic tank before the loading and dye test. Depending on its size an empty septic tank could require 2-3 days' worth of water to re-fill the tank.
Testing by running water into an empty septic tank means that the "loading water" run into the
system during the dye test procedure is simply filling the tank rather than testing the ability of the
drain field to absorb effluent.
Pumping a septic tank prior to purchasing a home may or may not be necessary,
depending on the age and service history of the system
and the results of the visual inspection and loading and dye test.
For example, if a tank is less than two years old or was pumped in the last year,
and if there are no other signs of septic problems at the site, we might defer
the pumpout. In this case we would strongly recommend calling the pumper to ask
about the condition of the system at the time they last cleaned it.
But pumping the tank for diagnostic reasons can be helpful in any case.
Important additional information, available when the tank is pumped,
can tell you if it was past-due for pumping (risking damaging the drain fields) and if it is damaged.
You'll also know exactly where the tank
is, if it's concrete, steel, fiberglass or home made, if it has been damaged, if the baffles are broken,
if the tank has been flooded (indicating a blocked drainfield), and if the tank has a safe cover.
Even if there are no signs of trouble from the inspection and dye test, if nothing is known about the system history, or if
it is known that the system has not been opened and pumped in 3 years or longer, this step
is strongly advised.
If the septic tank has been pumped quite recently, you should call the pumping contractor to ask
if, at the time of pumping, the contractor observed any indications of system problems or upcoming system repairs.
This is a subchapter of "5-HOW TO INSPECT & TEST When, Where, Why, and How to Inspect and Test a Septic System - for Home Buyers, Step-by-Step"
which can be found
at HOME BUYER'S SEPTIC TEST
Septic Tank Pumpout Timing Mistakes
Failure to pump the septic tank frequently enough:
leading to an early drainfield failure and costly repairs
Pumping or cleaning the septic tank too frequently,
wasting money (though you're wasting a lot less money than the cost of a new drainfield. A lot of septic pumping contractors and some other "experts" give a fixed rule of thumb that serves
their own interest, such as "pump your septic tank every year" or "pump your septic tank every two years" or in a case we know about in Minnesota, "pump the septic tank every couple of months or after you've had a lot of visitors".
Contractors may give this advice without
first having actually considered any information about the septic system capacity, level of
usage, age, or other conditions. It's a great example of "OPM" or "other people's money" - spending someone else's money to reduce your risk that they'll complain that your advice wasn't safe enough.
Pumping the septic tank with the fantasy that doing so will "fix" a clogged or failed drainfield.
All you really gain is a few days of toilet flushing before the tank has re-filled.
Actually inspecting the septic system, diagnosing any problems or failures, and inspecting conditions inside the septic tank will tell us whether the tank is being pumped at the correct frequency.
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"International Private Sewage Disposal Code," 1995, BOCA-708-799-2300, ICBO-310-699-0541, SBCCI 205-591-1853, available from those code associations.
"Manual of Policy, Procedures, and Guidelines for Onsite Sewage Systems," Ontario Reg. 374/81, Part VII of the Environmental
Protection Act (Canada), ISBN 0-7743-7303-2, Ministry of the Environment,135 St. Clair Ave. West, Toronto Ontario M4V 1P5 Canada $24. CDN.
Manual of Septic Tank Practice, US Public Health Service's 1959.
Advanced Onsite Wastewater Systems Technologies, Anish R. Jantrania, Mark A. Gross. Anish Jantrania, Ph.D., P.E., M.B.A., is a Consulting Engineer, in Mechanicsville VA, 804-550-0389 (2006). Outstanding technical reference especially on alternative septic system design alternatives. Written for designers and engineers, this book is not at all easy going for homeowners but is a text I recommend for professionals--DF.
Country Plumbing: Living with a Septic System, Hartigan, Gerry: $ 9.95; ALAN C HOOD & TP;
Quoting an Amazon reviewer's comment, with which we agree--DF:This book is informative as far as it goes and might be most useful for someone with an older system. But it was written in the early 1980s. A lot has changed since then. In particular, the book doesn't cover any of the newer systems that are used more and more nowadays in some parts of the country -- sand mounds, aeration systems, lagoons, etc.
Septic System Owner's Manual, Lloyd Kahn, Blair Allen, Julie Jones, Shelter Publications, 2000 $14.95 U.S. - easy to understand, well illustrated, one of the best practical references around on septic design basics including some advanced systems; a little short on safety and maintenance. Both new and used (low priced copies are available, and we think the authors are working on an updated edition--DF.
Quoting from one of several Amazon reviews: The basics of septic systems, from underground systems and failures to what the owner can do to promote and maintain a healthy system, is revealed in an excellent guide essential for any who reside on a septic system. Rural residents receive a primer on not only the basics; but how to conduct period inspections and what to do when things go wrong. History also figures into the fine coverage.
Water Wells and Septic Systems Handbook, R. Dodge Woodson. This book is in the upper price range, but is worth the cost for serious septic installers and designers.
Quoting Amazon: Each year, thousands upon thousands of Americans install water wells and septic systems on their properties. But with a maze of codes governing their use along with a host of design requirements that ensure their functionality where can someone turn for comprehensive, one-stop guidance? Enter the Water Wells and Septic Systems Handbook from McGraw-Hill.
Written in language any property owner can understand yet detailed enough for professionals and technical students this easy-to-use volume delivers the latest techniques and code requirements for designing, building, rehabilitating, and maintaining private water wells and septic systems. Bolstered by a wealth of informative charts, tables, and illustrations, this book delivers:
* Current construction, maintenance, and repair methods
* New International Private Sewage Disposal Code
* Up-to-date standards from the American Water Works Association
Wells and Septic System, Alth, Max and Charlet, Rev. by S. Blackwell Duncan, $ 18.95; Tab Books 1992. We have found this text very useful for conventional well and septic systems design and maintenance --DF.
Quoting an Amazon description:Here's all the information you need to build a well or septic system yourself - and save a lot of time, money, and frustration. S. Blackwell Duncan has thoroughly revised and updated this second edition of Wells and Septic Systems to conform to current codes and requirements. He also has expanded this national bestseller to include new material on well and septic installation, water storage and distribution, water treatment, ecological considerations, and septic systems for problem building sites.
US EPA ONSITE WASTEWATER TREATMENT SYSTEMS MANUAL [online copy, free] Top Reference: US EPA's Design Manual for Onsite Wastewater Treatment and Disposal, 1980, available from the US EPA, the US GPO Superintendent of Documents (Pueblo CO), and from the National Small Flows Clearinghouse. Original source http://www.epa.gov/ORD/NRMRL/Pubs/625R00008/625R00008.htm Onsite wastewater treatment and disposal systems,
Richard J Otis, published by the US EPA. Although it's more than 20 years old, this book remains a useful reference for septic system designers.
U.S. Environmental Protection Agency, Office of Water Program Operations; Office of Research and Development, Municipal Environmental Research Laboratory; (1980)
Onsite Wastewater Disposal, R. J. Perkins;
Quoting from Amazon: This practical book, co-published with the National Environmental Health Association, describes the step-by-step procedures needed to avoid common pitfalls in septic system technology.
Valuable in matching the septic system to the site-specific conditions, this useful book will help you install a reliable system in both suitable and difficult environments. Septic tank installers, planners, state and local regulators, civil and sanitary engineers, consulting engineers, architects, homeowners, academics, and land developers will find this publication valuable.
Onsite Wastewater Treatment Systems, Bennette D. Burks, Mary Margaret Minnis, Hogarth House 1994 - one of the best septic system books around, suffering a bit from small fonts and a weak index. While it contains some material more technical than needed by homeowners, Burks/Minnis book on onsite wastewater treatment systems a very useful reference for both property owners and septic system designers.
Septic Tank/Soil-Absorption Systems: How to Operate & Maintain, Equipment Tips, U.S. Department of Agriculture, 8271 1302, 7100 Engineering, 2300 Recreation, September 1982, web search 08/28/2010, original source: http://www.fs.fed.us/t-d/pubs/pdfimage/82711302.pdf
US EPA ONSITE WASTEWATER TREATMENT SYSTEMS MANUAL Top Reference: US EPA's Design Manual for Onsite Wastewater Treatment and Disposal, 1980, available from the US EPA, the US GPO Superintendent of Documents (Pueblo CO), and from the National Small Flows Clearinghouse. Original source http://www.epa.gov/ORD/NRMRL/Pubs/625R00008/625R00008.htm
The NSFC Products List has an excellent list of design manuals/modules National Small Flows Clearinghouse (NSFC) now (2019/12/13) hosted at http://www.nesc.wvu.edu/ Tel: 304-293-4191 e-mail info@mail.nesc.wvu.edu.
The National Small Flows Clearinghouse (NSFC) was funded by the U.S. Environmental Protection Agency (EPA) to help America's small communities and individuals solve their wastewater problems through objective information about onsite wastewater collection and treatment systems. NSFC products and information are the only national resource of its type, dealing with small community wastewater infrastructure. or by telephone 800-624-8301
In addition to citations & references found in this article, see the research citations given at the end of the related articles found at our suggested
Carson, Dunlop & Associates Ltd., 120 Carlton Street Suite 407, Toronto ON M5A 4K2. Tel: (416) 964-9415 1-800-268-7070 Email: info@carsondunlop.com. Alan Carson is a past president of ASHI, the American Society of Home Inspectors.
Carson Dunlop Associates provides extensive home inspection education and report writing material. In gratitude we provide links to tsome Carson Dunlop Associates products and services.