Community Water System · PWS MA2177000
Medway Water Department
Medway, Massachusetts 02053 - drinking water served from groundwater sources to 13,115 people, tracked in EPA SDWIS and UCMR5.
- 13,115
- People served
- 370
- EPA violations
- 22
- Health-based
- 4 PFAS
- UCMR5 result
The verdict
EPA records 370 drinking-water violations at Medway Water Department, 6% of them health-based - above the Massachusetts per-system average, and UCMR5 testing detected 4 PFAS compounds.
- 370
- Total EPA violations on record
- 6%
- Health-based (MCL / treatment failure)
- 13,115
- People served by this system
- 4
- PFAS compounds detected (UCMR5)
Water Quality Snapshot: Medway Water Department
Medway Water Department is a local-owned community water system that delivers drinking water to 13,115 residents in Medway, Massachusetts (Norfolk County) through 3,852 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 370 total violations for this system , of which 22 (6%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 330 monitoring and reporting violations are on file. The most recent violation on record dates to 2017.
The most frequently cited contaminant at this system is Coliform (TCR), recorded in 20 violations (MCL, health-based). Under EPA's UCMR5 PFAS monitoring program, 4 PFAS compounds were detected in samples collected from this system, with a maximum reported concentration of 7.2 ppt (parts per trillion). PFAS are persistent synthetic chemicals linked to health effects at very low exposure levels.
Across Massachusetts, EPA tracks 1,599 public water systems serving 10,332,845 people, with 73,886 cumulative violations and 7,389 health-based violations on record. About 95% of systems in the state carry at least one violation, and state-wide the average per system is 46.2 violations. Statewide, 148 of 263 UCMR5-tested systems have reported PFAS detections (56.3%).
Medway Water Department's 370 violations sit above the Massachusetts average.
All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.
4 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 3,852
- County
- Norfolk
- School/Daycare
- No
- MCL Violations
- 20
- Monitoring Violations
- 330
- Treatment Tech Violations
- 2
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MCL | 20 | 2014 |
| Endrin | MR | 8 | 2007 |
| Heptachlor epoxide | MR | 8 | 2007 |
| Pentachlorophenol | MR | 8 | 2007 |
| Toxaphene | MR | 8 | 2007 |
| 2,4,5-TP | MR | 8 | 2007 |
| BHC-GAMMA | MR | 8 | 2007 |
| Total Polychlorinated Biphenyls (PCB) | MR | 8 | 2007 |
| 1,2-DIBROMO-3-CHLOROPROPANE | MR | 8 | 2007 |
| Di(2-ethylhexyl) phthalate | MR | 8 | 2007 |
| Dinoseb | MR | 8 | 2007 |
| Diquat | MR | 8 | 2007 |
| Endothall | MR | 8 | 2007 |
| Glyphosate | MR | 8 | 2007 |
| HEXACHLOROBENZENE | MR | 8 | 2007 |
| Hexachlorocyclopentadiene | MR | 8 | 2007 |
| Carbofuran | MR | 8 | 2007 |
| Chlordane | MR | 8 | 2007 |
| Methoxychlor | MR | 8 | 2007 |
| Dalapon | MR | 8 | 2007 |
| Di(2-ethylhexyl) adipate | MR | 8 | 2007 |
| Picloram | MR | 8 | 2007 |
| Atrazine | MR | 8 | 2007 |
| LASSO | MR | 8 | 2007 |
| 2,3,7,8-TCDD | MR | 8 | 2007 |
| Heptachlor | MR | 8 | 2007 |
| 2,4-D | MR | 8 | 2007 |
| Benzo(a)pyrene | MR | 8 | 2007 |
| ETHYLENE DIBROMIDE | MR | 8 | 2007 |
| OXAMYL | MR | 8 | 2007 |
PFAS Testing Results (UCMR5)
Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 8 of 116 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| 4:2 FTS | 4/8/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFEESA | 4/8/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| 8:2 FTS | 4/8/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFMPA | 4/8/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFPeA | 4/8/2025 | 3.80 ppt | 3.00 ppt | Detected |
| PFMBA | 4/8/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| NFDHA | 4/8/2025 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFPeS | 4/8/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| NEtFOSAA | 4/8/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFTA | 4/8/2025 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFTrDA | 4/8/2025 | <7.00 ppt | 7.00 ppt | Not Detected |
| 6:2 FTS | 4/8/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 4/8/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| NMeFOSAA | 4/8/2025 | <6.00 ppt | 6.00 ppt | Not Detected |
| PFHpS | 4/8/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxS | 4/8/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| ADONA | 4/8/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBA | 4/8/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFHpA | 4/8/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBS | 4/8/2025 | 3.00 ppt | 3.00 ppt | Detected |
| PFNA | 4/8/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOS | 4/8/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOA | 4/8/2025 | 7.20 ppt | 4.00 ppt | Detected |
| PFDA | 4/8/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDoA | 4/8/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxA | 4/8/2025 | 3.10 ppt | 3.00 ppt | Detected |
| PFUnA | 4/8/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| 9Cl-PF3ONS | 4/8/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| HFPO-DA | 4/8/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFHxS | 4/8/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| ADONA | 4/8/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| 9Cl-PF3ONS | 4/8/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 4/8/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFUnA | 4/8/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFHxA | 4/8/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDoA | 4/8/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDA | 4/8/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFOA | 4/8/2025 | 4.70 ppt | 4.00 ppt | Detected |
| PFNA | 4/8/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| HFPO-DA | 4/8/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| NFDHA | 4/8/2025 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFOS | 4/8/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFBA | 4/8/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| 6:2 FTS | 4/8/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| 4:2 FTS | 4/8/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| 8:2 FTS | 4/8/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFMPA | 4/8/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFPeA | 4/8/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpA | 4/8/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFEESA | 4/8/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
Verify This Water System
The figures above are aggregated from EPA's public databases. To verify the underlying records, or to file a complaint, request a Consumer Confidence Report, or check current monitoring status, go directly to the federal and state regulators that enforce the Safe Drinking Water Act for Medway Water Department.
EPA SDWIS, Federal Reports
EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:
View PWS ID MA2177000 on SDWISSource: EPA SDWIS Federal Reports Search
Massachusetts Drinking Water Authority
MassDEP, Drinking Water Program is the primacy agency that licenses and inspects Medway Water Department under EPA-delegated authority.
Open MA regulator portalSource: MassDEP, Drinking Water Program
Violation Timeline
Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.
| Year (latest) | Contaminant | Category | Count | EPA Record |
|---|---|---|---|---|
| 2017 | Consumer Confidence Rule | Other | 6 | SDWIS / MA2177000 / 7000 |
| 2014 | Coliform (TCR) | MCL | 20 | SDWIS / MA2177000 / 3100 |
| 2014 | Chlorine | MR | 6 | SDWIS / MA2177000 / 0999 |
| 2009 | Radium-226 | MR | 3 | SDWIS / MA2177000 / 4020 |
| 2009 | Radium-228 | MR | 3 | SDWIS / MA2177000 / 4030 |
| 2008 | Coliform (TCR) | MR | 6 | SDWIS / MA2177000 / 3100 |
| 2008 | Lead and Copper Rule | MR | 3 | SDWIS / MA2177000 / 5000 |
| 2007 | Endrin | MR | 8 | SDWIS / MA2177000 / 2005 |
| 2007 | Heptachlor epoxide | MR | 8 | SDWIS / MA2177000 / 2067 |
| 2007 | Pentachlorophenol | MR | 8 | SDWIS / MA2177000 / 2326 |
| 2007 | Toxaphene | MR | 8 | SDWIS / MA2177000 / 2020 |
| 2007 | 2,4,5-TP | MR | 8 | SDWIS / MA2177000 / 2110 |
| 2007 | BHC-GAMMA | MR | 8 | SDWIS / MA2177000 / 2010 |
| 2007 | Total Polychlorinated Biphenyls (PCB) | MR | 8 | SDWIS / MA2177000 / 2383 |
| 2007 | 1,2-DIBROMO-3-CHLOROPROPANE | MR | 8 | SDWIS / MA2177000 / 2931 |
How Medway Water Department Compares
Cross-reference this system's record against state averages and the federal MCL framework for context.
| Metric | Medway Water Department | Massachusetts avg | Federal benchmark |
|---|---|---|---|
| Total violations | 370 | 46.2 | SDWA compliance, any non-zero count is a recorded breach |
| Health-based violations | 22 | 4.6 | Indicates a contaminant exceeded a federal MCL |
| PFAS detection | 4 compounds | 56.3% | EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt |
| Population served | 13,115 | 6,462 | Sizing context for compliance burden |
Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 1,599 regulated public water systems in Massachusetts.
Federal MCL reference, Safe Drinking Water Act thresholds ▼
| Contaminant | Federal MCL / Action Level | Note |
|---|---|---|
| Lead | 0 mg/L (Action Level: 0.015 mg/L) | Lead and Copper Rule treatment technique |
| Arsenic | 0.010 mg/L (10 ppb) | Health-based MCL since 2006 |
| Total Coliform | Treatment technique (RTCR) | Indicator organism, monitoring trigger |
| PFOA / PFOS (PFAS) | 4.0 ppt each (final 2024 rule) | Compliance deadline 2029 (EPA proposed extending to 2031, not yet final as of May 2026) |
| Nitrate (as N) | 10 mg/L | Acute health risk for infants |
Frequently Asked Questions
Is Medway Water Department water safe to drink? ▼
How many people does Medway Water Department serve? ▼
What type of violations does Medway Water Department have? ▼
Has PFAS been detected in Medway Water Department water? ▼
What water source does Medway Water Department use? ▼
Where does this data come from? ▼
Read our methodology - how this data is sourced, computed, and verified.
Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This system's figures are rendered directly from EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.