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Not health advice. Contact your local water utility for concerns.
Data from EPA Water Quality Reports. For official information, contact your water utility or health department.
EPA records for BROCKTON WATER DEPARTMENT • Updated September 2026
Grade A — based on EPA compliance records, lead testing and PFAS monitoring
BROCKTON WATER DEPARTMENT has a clean recent record: no health-based violations in the last five years and no lead, PFAS or historical monitoring result that costs it more than a few points.
Yes — by EPA's records, Brockton's tap water earns a A: no health-based violations in five years, lead at 4 ppb (90th percentile) and no PFAS detected. Lead from home plumbing is the main remaining risk.
By EPA's records, yes. BROCKTON WATER DEPARTMENT earns a A: no health-based violations in the last five years, a lead 90th-percentile result of 4 ppb, and no PFAS detected in UCMR5 sampling. Lead from your own plumbing is the main risk city data cannot see.
BROCKTON WATER DEPARTMENT's most recent Lead and Copper Rule result (2021-01-01 to 2023-12-31) was 4 ppb at the 90th percentile, below EPA's 15 ppb action level. Because lead usually comes from service lines and household plumbing, homes built before 1986 should still test at the tap.
No. None of the 116 UCMR5 PFAS results for BROCKTON WATER DEPARTMENT (2023-03-07 to 2023-12-06) were at or above the reporting limit of roughly 3–5 ppt.
BROCKTON WATER DEPARTMENT has 2 violations on file since 2016: 0 health-based in the last five years and 0 monitoring or reporting violations in that window. Monitoring violations are paperwork lapses, not measured contamination.
BROCKTON WATER DEPARTMENT reports surface water as its primary source and serves about 105,788 people (EPA PWSID MA4044000).
Not on the strength of EPA's data for BROCKTON WATER DEPARTMENT. A filter still helps with taste and with lead from your own plumbing, which no city-level test can measure.
Want to know what's really in your Brockton tap water?
EPA data describes water leaving the plant — a certified mail-in lab test shows what reaches your own faucet, including lead from household plumbing.
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BROCKTON WATER DEPARTMENT · SDWIS records since 2016 · 5-year window starts 2021-09-07
EPA records no health-based violations for this system in the last five years. Older health-based violations (since 2016) are listed below for context.
| Violation | Category | Compliance period | Status |
|---|---|---|---|
| Maximum Contaminant Level Violation, AverageTTHM | MCL exceeded | 2018-04-01 → 2018-06-30 | Resolvedreturned 2018-06-30 |
| Consumer Confidence Report Complete Failure to ReportConsumer Confidence Rule | Other | 2023-07-01 | Resolvedreturned 2023-08-17 |
Source: ECHO SDWA bulk download (SDWA_VIOLATIONS_ENFORCEMENT.csv, SDWIS 2026Q2, file dated 2026-07-09, fetched 2026-09-06)
EPA Lead and Copper Rule 90th-percentile results reported by BROCKTON WATER DEPARTMENT
Well below the 15 ppb action level. In the most recent monitoring period on file (2021-01-01 to 2023-12-31), 90% of the homes BROCKTON WATER DEPARTMENT sampled had lead at or below 4 ppb.
EPA's action level is 15 ppb (dropping to 10 ppb under the 2024 Lead and Copper Rule Improvements). There is no safe level of lead; the 90th-percentile figure describes the system, not your tap — homes with lead service lines or pre-1986 plumbing can be higher.
| Monitoring period | Lead 90th percentile | vs 15 ppb action level |
|---|---|---|
| 2021-01-01 → 2023-12-31 | 4 ppb | Well below the 15 ppb action level |
| 2018-01-01 → 2020-12-31 | 3 ppb | Well below the 15 ppb action level |
| 2015-01-01 → 2017-12-31 | 1 ppb | Well below the 15 ppb action level |
| 2012-01-01 → 2014-12-31 | 2 ppb | Well below the 15 ppb action level |
| 2009-01-01 → 2011-12-31 | 5 ppb | Below the action level, but detectable |
| 2008-01-01 → 2008-06-30 | 2 ppb | Well below the 15 ppb action level |
| 2007-07-01 → 2007-12-31 | 3 ppb | Well below the 15 ppb action level |
| 2004-01-01 → 2006-12-31 | 16 ppb | Above the 15 ppb action level |
| 2000-07-01 → 2003-06-30 | 6 ppb | Below the action level, but detectable |
| 1999-07-01 → 2000-06-30 | 8 ppb | Below the action level, but detectable |
| 1998-07-01 → 1999-06-30 | 9 ppb | Below the action level, but detectable |
| 1997-07-01 → 1998-06-30 | 8 ppb | Below the action level, but detectable |
Source: ECHO SDWA bulk download (SDWA_LCR_SAMPLES.csv, SDWIS 2026Q2, file dated 2026-07-09, fetched 2026-09-06)
EPA UCMR5 monitoring, 2023-03-07 to 2023-12-06 · 116 PFAS results at entry points to the distribution system
No PFAS detected. None of the 116 UCMR5 PFAS results for BROCKTON WATER DEPARTMENT were at or above the method reporting limit. Reporting limits are about 3–5 ppt, so “not detected” means below that threshold — not proven zero.
| Compound | Detects / samples | Max (ppt) | Reporting limit | EPA MCL |
|---|---|---|---|---|
| PFOA | 0 / 4 | < 4 | 4 ppt | 4 ppt |
| PFOS | 0 / 4 | < 4 | 4 ppt | 4 ppt |
| PFHxS | 0 / 4 | < 3 | 3 ppt | 10 ppt |
| PFNA | 0 / 4 | < 4 | 4 ppt | 10 ppt |
| HFPO-DA | 0 / 4 | < 5 | 5 ppt | 10 ppt |
| PFBS | 0 / 4 | < 3 | 3 ppt | hazard index only |
“< 4 ppt” means below the laboratory reporting limit, not zero. ppt = parts per trillion (ng/L). Results are for finished water leaving the treatment plant.
What PFAS are and how to remove them →
Source: UCMR5 occurrence data, EPA Data Summary July 2026 (UCMR5_All.txt)
EPA Six-Year Review 4 compliance samples for BROCKTON WATER DEPARTMENT · finished water only · dated data, released 2024
These are the regulated-contaminant samples BROCKTON WATER DEPARTMENT reported to its state between 2012 and 2019 — the most recent nationwide sample-level dataset EPA has published. Total trihalomethanes (TTHM), Haloacetic acids (HAA5) are flagged below; the status column explains why. Treat this as history, not today's tap water.
| Contaminant | Samples | Average | Max | EPA limit | Status |
|---|---|---|---|---|---|
| Arsenic | 191 detects | 0.316 µg/L | 6 µg/L | 10 µg/LMCL | Within MCL |
| Nitrate (as N) | 2018 detects | 0.191 mg/L | 0.54 mg/L | 10 mg/LMCL | Within MCL |
| Fluoride | 190 detects | 0 mg/L | ND | 4 mg/LMCL | Not detected |
| Chromium (total) | 190 detects | 0 µg/L | ND | 100 µg/LMCL | Not detected |
| Total trihalomethanes (TTHM) | 253 | 53.732 µg/L | 122.9 µg/L | 80 µg/LMCL (LRAA) | 37 single samples over MCL; average within limit |
| Haloacetic acids (HAA5) | 248 | 22.335 µg/L | 78 µg/L | 60 µg/LMCL (LRAA) | 2 single samples over MCL; average within limit |
Averages count non-detects as zero. TTHM and HAA5 limits are locational running annual averages, so a single high sample is not a violation — we grade those on the average only. Lead and copper rows are individual tap samples and are shown for context; compliance (and our score) uses the 90th-percentile result above. LRAA = locational running annual average; ND = not detected.
Source: SYR4 Six-Year Review compliance monitoring data 2012–2019 (released 2024-03)
BROCKTON WATER DEPARTMENT · 24,478 service lines inventoried · Q2 2026 snapshot
BROCKTON WATER DEPARTMENT reports 650 service lines that are lead or galvanized-requiring-replacement (2.7% of the lines it has inventoried), plus 7,971 lines whose material is still unknown. A lead service line is the pipe between the water main and a building, so treated water can pick up lead after it leaves the plant — which city-level testing does not capture. Under EPA's Lead and Copper Rule Improvements, utilities must replace lead lines within 10 years starting in 2027.
Source: EPA SDWIS Service Line Inventory (Q2 2026) · PWS ID MA4044000 · See all Massachusetts lead service lines. We may earn a commission from filters and test kits, at no extra cost to you.
Surface-water systems draw from rivers, lakes or reservoirs and must filter and disinfect, which is why disinfection byproducts (TTHM, HAA5) are the readings to watch.
How to test your tap water and the treatment options that actually fit Brockton homes
The most reliable way to know what is actually coming out of your tap is a certified mail-in lab test. City-wide EPA data (like the report above) reflects the water leaving the treatment plant, but contaminants such as lead and copper can be picked up from your own service line and household plumbing — so the water at your Brockton faucet can differ from the system average. A state-certified lab measures dozens of contaminants at once with results you can trust; you can also find one near you through the EPA's certified-lab list at epa.gov/dwlabcert. Hardware-store test strips are cheaper and instant, but they only screen for a few basics (chlorine, hardness, pH, and a rough lead pass/fail) and are far less accurate — treat them as a first look, not a diagnosis.
Match the treatment to what your test finds. Reverse osmosis (RO) removes the widest range of contaminants — lead, arsenic, nitrate, PFAS, and dissolved solids — which makes an under-sink reverse osmosis system the most thorough choice for Brockton households with heavy-metal or PFAS concerns. If your main issue is taste, odor, or chlorine, an activated carbon filter (pitcher, faucet, or under-sink) is simpler and cheaper and handles chlorine and many organic compounds well, though carbon alone does not remove arsenic, nitrate, or most PFAS. NSF-certified pitchers rated for lead reduction are the easiest way to start today while you decide on a permanent setup.
We may earn a commission from testing kits and filters purchased through these links, at no extra cost to you.
Brockton ranks #1 of 48 graded Massachusetts cities.
By EPA's records, yes. BROCKTON WATER DEPARTMENT earns a A: no health-based violations in the last five years, a lead 90th-percentile result of 4 ppb, and no PFAS detected in UCMR5 sampling. Lead from your own plumbing is the main risk city data cannot see.
BROCKTON WATER DEPARTMENT's most recent Lead and Copper Rule result (2021-01-01 to 2023-12-31) was 4 ppb at the 90th percentile, below EPA's 15 ppb action level. Because lead usually comes from service lines and household plumbing, homes built before 1986 should still test at the tap.
No. None of the 116 UCMR5 PFAS results for BROCKTON WATER DEPARTMENT (2023-03-07 to 2023-12-06) were at or above the reporting limit of roughly 3–5 ppt.
BROCKTON WATER DEPARTMENT has 2 violations on file since 2016: 0 health-based in the last five years and 0 monitoring or reporting violations in that window. Monitoring violations are paperwork lapses, not measured contamination.
BROCKTON WATER DEPARTMENT reports surface water as its primary source and serves about 105,788 people (EPA PWSID MA4044000).
Not on the strength of EPA's data for BROCKTON WATER DEPARTMENT. A filter still helps with taste and with lead from your own plumbing, which no city-level test can measure.
Even with good water quality, a filter removes trace contaminants and improves taste.
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