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Residential Lead Results
Massachusetts Water Resources Authority

Regulatory Lead and Copper Rule Results

Linked below are individual sample results collected under the Lead and Copper Rule going back to 1992, when the Lead and Copper Rule came into effect.

Lead and Copper Rule Test Results

2010-2017 (PDF)

1992-2009 (PDF)

The results are presented with addresses eliminated to protect the individuals' privacy. Each volunteer who participated in the sampling program received his or her own individual results.

These individual results provide a snapshot of what is happening in a specific house when the water has sat stagnant. Because the sampling protocol is designed to evaluate the effectiveness of corrosion control, the results do not necessarily provide real information about the water a typical customer would typically drink.

As required by the Lead and Copper Rule, sample only the homes most likely to have any lead, and then sample that stagnant water most likely to have leached any lead. Most consumers do not actually consume that stagnant water.

Under the federal Lead and Copper Rule, nine out of 10, or 90 percent of samples are required to be below the lead Action Level of 15 ug/l (or parts per billion/ppb).

For More information about lead, including summary level information about the substantial decrease in lead levels after MWRA began operating corrosion control in 1996, visit our Lead Test Results for Drinking Water page.

Results Not Part of the Regulatory Sampling

The following are residential lead results that were not part of the Lead and Copper Rule sampling.

The goal for lead results is to be as low as possible. Residents and communities are urged to take corrective actions if results at a location are above the lead Action Level of 15 ug/l (or parts per billion/ppb). For More information about actions that can reduce lead levels, visit our What You Need to Know About Lead In Tap Water page.

All of the results below were communicated to homeowners. There are four separate categories for these results:

Massachusetts Department of Public Health (MDPH) Samples:  These are samples collected by the MDPH Lead Poisoning Prevention Program.  The MDPH staff visit homes that have a child who has elevated lead levels, helping the family investigate possible sources of lead, such as lead paint or lead dust, as these are the typical causes of lead poisoning. Beginning in 2016, MDPH began including water testing as part of the investigations.  Two samples from the kitchen sink are collected – one first draw after sitting overnight, and one after the water ran for 30 seconds.  MWRA reports the results back to MDPH once they are analyzed at MWRA’s laboratory. MDPH then provides the results to the residents, preserving the required confidentiality under federal health privacy laws. As the results show, the levels of lead in these homes has generally been very low, with only one of the nearly 150 samples over the Action Level. MDPH Sample Results for 2017 (PDF)

Investigation Samples:
These are samples to evaluate water quality in a home or building, usually initiated by the local water department as a result of an inquiry or complaint.  Typically, multiple tests are performed, including lead.  Lead was generally not the main reason for the investigation. Investigation Sample results for 2017 (PDF)

Lead Request Samples:
These are samples from homes where the local water department specifically wanted to test for lead, even though the home may not have a lead service line.  Lead Request Sample Results for 2017 (PDF)

Lead Service Line Samples
:  These are samples taken from homes that have had all or a portion of their lead service lines replaced by the local water department.  If two samples were taken from one home, those are listed as 1 and 1A, the second sample is usually one that is taken after the water is flushed. Lead Service Line Sample Results for 2017 (PDF)

If you are interested in having your water tested, a list of private labs is available on our DEP Certfied Labs page.

Lead Testing in Schools

Starting on April 1, 2016 MWRA, in coordination with the Department of Environmental Protection (DEP), provided no cost lab analysis and technical assistance for schools and day care centers across all of MWRA’s water communities. Many communities worked with DEP on the testing, while others used private labs. Almost all MWRA communities participated in the program, and sample tests and assistance are still on-going. As of March 3, 2017 the MWRA Lab received 12,775 sample bottles from 295 schools from 35 communities, and performed 14,341 lead tests.  MWRA reported all school results to the DEP. Most of the results are available on the DEP website:

DEP: Search for Lead and Copper Drinking Water Results in Schools/Childcare

DEP: More information on programs related to lead in schools

Some results also may be available through your local community website, DPW, or school department.

MWRA Contact

If you have any questions, please contact


  Updated February 1, 2018