Lead Water Piping (C) Daniel FriedmanLead Plumbing Pipe Hazards
How to Identify Lead Drain & Water Supply Piping in Buildings

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Lead pipes in buildings:

This article discusses identification of lead drain or water supply piping, durability, leaks, health questions. We give a brief history of the use of lead supply & drain pipes, we illustrate where you will find and how to recognize lead pipes, and we discuss the question of which lead pipes need replacement and what the health and leak issues really are with lead plumbing.

Our page top photo illustrates an easy-to-spot lead water supply pipe: the building water main entering at left of the water meter. The articles at this website will answer most questions about water supply & drain piping, wells, & water tanks as well as many other building plumbing system inspection or defect topics.

We also provide a MASTER INDEX to this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need.

Lead Water Supply & Drain Piping in buildings

How to spot lead water pipes in buildings

Lead drain pipe below a tub (C) Daniel Friedman

[Click to enarge any image]

Lead Hazard Warning: consumption or absorption of lead into the human body is hazardous, particularly for children but in fact for anyone. [1] & [3-23].

And at least one correspondent has expressed the view that there is no level of lead exposure for which they have not found an adverse effect. [23]

Our lead water pipe photo at left illustrates one of quite a few places to look for hidden lead pipes in older buildings: in the plumbing access behind a bath tub or shower.

Portions of the following summary are from Carson Dunlop Associates' Home Reference Book, adated & used with permission:

Lead piping was used between the street main and the house up until the 1950s. A good deal of lead supply line is still in use, and the health authorities indicate that as long as it is used regularly, there is no functional [that is flow] difficulty with it.

Watch out: some assert that one can avoid the hazards of lead in water when the water has not been run for some time, by running water several minutes before using it.[2]

In fact our own tests conducted in concert with City authorities in Poughkeepsie NY at homes with lead water entry mains confirmed that if the city flushed out nearby water mains and the homeowner flushed out the home's water piping until the water ran cold - that is, was fresh water from the mains - immediately before collecting a water sample to check for lead, the resultant lead levels were very low and were often below the city's minimum acceptable lead levels.[22]

However as we point out in a companion article LEAD IN DRINKING WATER, HOW to REDUCE

In November 2010 the New York Times reported that in 2009 only 5.4% of samples had elevated lead, but in 2010 tests of 222 water samples found lead from 16-30 ppb in 14% of the samples. Although at these low levels the city did not consider the lead a clear health hazard, the city advised residents to run water for "at least 30 seconds" before drinking or cooking with it. A similar advisory was issued in 2005.

Watch out: the length of time needed to run water to flush out high-lead-level water that has been sitting in piping overnight depends on the total length of pipe between your tap and the street as well as use by other building occupants. If you run water at a tap until it is cold you have most likely successfully flushed the lines. This same principle applies to private residences.

EPA Lead limit: Although most homes have very low levels of lead in their drinking water, some homes in some communities have lead levels above the EPA action level of 15 parts per billion (ppb), or 0.015 milligrams of lead per liter of water (mgL).

Under Federal Law water suppliers are required to have a program in place to minimize lead in drinking water by January 1, 1996. This program includes corrosion control treatment, source water treatment, and public education. We are also required to replace each lead service line that we control if the line contributes to lead concentrations of 15 ppb or more after we have completed the comprehensive treatment program. If you have any questions about how the requirements of the lead regulations are being carried out, call your local water department or health department.

Lead water entry mains & Lead Drain Pipes in Buildings

Lead Water Piping (C) Daniel Friedman

Our photo at above left shows a lead water main entering the building - to the left of the water meter.

Lead Drain Piping (C) Daniel Friedman

Above simliar but larger-diameter lead piping is used to drain plumbing fixtures.

In our OPINION both lead water supply piping and lead drain piping are potentially hazardous sources of lead in drinking water. The lead supply pipe risks are obvious and are discussed in this article. The hazard of lead drain piping are a bit more subtle and rest in the possible discharge of lead containing water into private sewer systems and thus into local aquifers.

The life expectancy of lead water supply piping is indefinite in some soils and in more corrosive soils we have plumbers' opinions that the service life of buried lead water supply piping is 40 to 50 years.

The life expectancy of lead drain piping may be 50 years or longer, but varies by water corrosivity and amount of use as well as mechanical disturbance. Below we include a photograph and text of corroded leaky lead drain piping below a toilet.

Should We Replace Lead Water Supply Pipes?

Lead water pipe (C) Daniel Friedman

Lead water supply piping may be a source of lead contamination of drinking water in some buildings.

Our own tests confirmed that where water is aggressive (leaching out lead from the pipes) and or where water that has been sitting in lead piping over night lead levels can be considerably higher than the US EPA standard cited above.

Our photo (left) shows a lead water supply pipe delivering water below a bathroom sink.

The right-hand pipe from the floor to the galvanized iron tee is lead, which you can recognize by the pipe diameter, by the lead wipe joint at the connection, and if necessary by gently scraping the pipe or using a magnet (lead is not magnetic but then niether is brass). Notice that the left hand water supply riser has already been replaced.

Watch out: our tests have found that running the water until cold water from the street is felt at the tap will reduce the levels of lead in building water and in some tests that lead level was below the current EPA standard. However in our OPINION and that of at least one writer from the US EPA, because of numerous variables this is not a safe reliable way to avoid ingesting lead.

There may be other reasons besides leaks to replace lead water supply piping, including possible health concerns (arguable), or poor water pressure or flow.

Lead Water Pipes & Poor Water Pressure: Up until World War II, most of the service pipes in built-up areas were lead. While these generally provide good service, they are small in diameter and may have to be replaced.

Long runs of relatively small (1/2-inch diameter) pipe result in considerable pressure drop, especially with more than one fixture flowing. Solutions include replacement with larger pipe or shortening the runs.

Also, lead is relatively soft, and if building settlement occurs, there is a chance of leakage or crimping the pipe. Leaks can also occur at connections as a result of long-term deterioration.

Another source of water entry main piping leaks is a little more subtle:

Many of the old lead service lines were connected to a galvanized nipple – a short piece of steel that was often in contact with the soil. This pipe rusts on the outside and inside, and may be close to the end of its life. It is often wise to replace this as a precautionary measure.

When Do We Need to Replace Lead Drain Piping?

Leaky lead toilet bend (C) Daniel Friedman

Leaky lead drain piping: Lead drain pipes in buildings are often leaky and need replacement. If there is no visible corrosion on the piping and no evidence of leakage, the lead drain pipe may be quite serviceable.

Don't assume that because visible building drain piping in an old house is cast iron that no lead pipe bends were used.

As our lead toilet bend photograph (left) shows, often the toilet in older homes was mounted using a lead drain line.

- Home Reference Book, used with permission.

Extra Costs for Renovation or Repair of Lead Drain Piping

Lead drain pipe below a tub (C) Daniel Friedman

Watch out: a lead drain line below a bath tub was identified in our photo at left - found by viewing the floor piping seen at a plumbing access opening in a 1935-built home in Poughkeepsie, NY.

We did not see any signs that the lead drain (the silver-gray colored, bulged horizontal pipe in our photo (left)).

But because this second-floor bathroom was constructed using a poured concrete floor, and because asbestos pipe insulation was present on the brass hot water supply pipe (parallel to and above the lead drain line shown at left ), when this drain leaks and needs repairs, extra costs will be involved, both to access the concrete encased piping, and to properly handle the asbestos insulation.


Until there is a leak, this piping and the asbestos insulation should be left undisturbed.

Quick Tests to Determine if Building Piping is Made of Brass, Copper, Galvanized Iron, or Lead

Reader comment: Ace DuraFlow Epoxy Liner ePipe® Restoration Services for deteriorated or clogged piping

2016/03/21 Bill said:

Have you become familiar with Ace Duraflo's EPipe solution? I encourage you to check it out as it is a much more cost effective way of dealing with both residential lead issues and pin hole leaks. You will also discover they are doing considerable relining of lead service pipes in the UK.


Ace DuraFlow EPipe is a procedure using a combination of heating, drying and cleaning (sanding) the interior of deteriorated piping followed by installation of an epoxy liner inside the pipe. The system is used in the North America, U.K., and other countries. The company's website does not (that I could find) provide much detail, cost comparisons, research or much technical information but the procedure indeed may be suitable for some piping problems depending on the pipe condition. The company notes that their process is suitable for domestic water systems (galvanized, copper, and PEX piping) and non-potable systems.

Please see details at TRENCHLESS PIPE REPAIRS

Lead Hazard Articles


Continue reading at LEAD IN DRINKING WATER, HOW to REDUCE - Lead water supply piping as a possible health concern? Leak concern? or select a topic from closely-related articles below, or see our complete INDEX to RELATED ARTICLES below.

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