Community Water System · PWS MA2115000
Groton Water Department
Operator location Groton, Massachusetts - 0% of 110 violations are health-based (lower-third health share (≤ 1%)); groundwater source; 5,456 served per SDWIS.
- 5,456
- People served (this PWS)
- 110
- EPA violations (this PWS)
- 0
- Health-based (this PWS)
- 1 PFAS
- UCMR5 (this PWS)
Groton Water Department standing, high SDWIS violation third
0% of 110 recorded violations are health-based - lower-third health share (≤ 1%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 0% is lower-third health share (≤ 1%). UCMR5: lower-third PFAS panel (≤ 2 compounds). Population rank #7,306 of 29,740 among systems serving 500+.
The verdict
Groton Water Department sits in the upper third of the sitemap cohort by violation count (110), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is large (5,456; larger served population (> 3,309)), so household exposure scale sits behind the violation mix. Health-based share is only 0% - almost all of this trail is monitoring or reporting. UCMR5 detected 1 PFAS compound (lower-third PFAS panel (≤ 2 compounds)).
- #7,306 of 29,740
- Population · /systems
- #229 of 418
- Population · MA
- 110
- Total EPA violations on record
- 0%
- Health-based (MCL / treatment failure)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
1 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 1,708
- County
- Middlesex
- School/Daycare
- No
- MCL Violations
- 0
- Monitoring Violations
- 91
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 26 | 2004 |
| Consumer Confidence Rule | Other | 4 | 2003 |
| Chlordane | MR | 2 | 2013 |
| Heptachlor | MR | 2 | 2013 |
| Pentachlorophenol | MR | 2 | 2013 |
| Toxaphene | MR | 2 | 2013 |
| 2,4,5-TP | MR | 2 | 2013 |
| Benzo(a)pyrene | MR | 2 | 2013 |
| Di(2-ethylhexyl) adipate | MR | 2 | 2013 |
| Dinoseb | MR | 2 | 2013 |
| Glyphosate | MR | 2 | 2013 |
| HEXACHLOROBENZENE | MR | 2 | 2013 |
| Hexachlorocyclopentadiene | MR | 2 | 2013 |
| Simazine | MR | 2 | 2013 |
| Total Haloacetic Acids (HAA5) | MR | 2 | 2006 |
| 1,2-DIBROMO-3-CHLOROPROPANE | MR | 2 | 2013 |
| OXAMYL | MR | 2 | 2013 |
| ETHYLENE DIBROMIDE | MR | 2 | 2013 |
| Heptachlor epoxide | MR | 2 | 2013 |
| Endothall | MR | 2 | 2013 |
| Diquat | MR | 2 | 2013 |
| LASSO | MR | 2 | 2013 |
| Endrin | MR | 2 | 2013 |
| Methoxychlor | MR | 2 | 2013 |
| Dalapon | MR | 2 | 2013 |
| TTHM | MR | 2 | 2006 |
| Picloram | MR | 2 | 2013 |
| Carbofuran | MR | 2 | 2013 |
| Di(2-ethylhexyl) phthalate | MR | 2 | 2013 |
| Atrazine | MR | 2 | 2013 |
Violation Count vs. the National Corpus
Groton Water Department has 110 recorded EPA violations, 75% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 25% carry more. 0% of this system's own violations are health-based (0 of 110), and it ranks #7,306 of 29,740 by population served among that same cohort.
EPA violations vs. the national water-system corpus
Public water systems serving 500+ people (EPA SDWIS)
110 Around the middle fewer violations than 25% of 29,740 water systems
the national water-system corpus, bucketed by value
Each bar is a band; taller bars hold more water systems. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source EPA SDWIS · 2026-05-15
PFAS Testing Results (UCMR5)
Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 1 of 116 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| 6:2 FTS | 6/4/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| NFDHA | 6/4/2024 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFEESA | 6/4/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMBA | 6/4/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeA | 6/4/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMPA | 6/4/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFUnA | 6/4/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| 4:2 FTS | 6/4/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxA | 6/4/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBA | 6/4/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| HFPO-DA | 6/4/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| ADONA | 6/4/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| 9Cl-PF3ONS | 6/4/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 6/4/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| 8:2 FTS | 6/4/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFHxS | 6/4/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBS | 6/4/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeS | 6/4/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHpA | 6/4/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpS | 6/4/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFNA | 6/4/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOS | 6/4/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOA | 6/4/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFDA | 6/4/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDoA | 6/4/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| NMeFOSAA | 6/4/2024 | <6.00 ppt | 6.00 ppt | Not Detected |
| NEtFOSAA | 6/4/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFTrDA | 6/4/2024 | <7.00 ppt | 7.00 ppt | Not Detected |
| PFTA | 6/4/2024 | <8.00 ppt | 8.00 ppt | Not Detected |
| 4:2 FTS | 6/4/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBS | 6/4/2024 | 3.00 ppt | 3.00 ppt | Detected |
| PFHpA | 6/4/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxS | 6/4/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFNA | 6/4/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOS | 6/4/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOA | 6/4/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFDA | 6/4/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDoA | 6/4/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxA | 6/4/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFUnA | 6/4/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| 9Cl-PF3ONS | 6/4/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| HFPO-DA | 6/4/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| 6:2 FTS | 6/4/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 6/4/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| 8:2 FTS | 6/4/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFMPA | 6/4/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFPeA | 6/4/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMBA | 6/4/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFEESA | 6/4/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| NFDHA | 6/4/2024 | <20.00 ppt | 20.00 ppt | Not Detected |
Health-based violations on Groton Water Department
0 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for MA2115000.
Sources: EPA SDWIS · MassDEP, Drinking Water Program
Nationwide peers
110 violations · 5,456 served: nearest cross-state SDWIS matches.
Cross-state systems with comparable violation load
Nearest cross-state community systems (500+ served) by total SDWIS violations on record.
Cross-state systems with similar served population
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Groton Water Department
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Massachusetts compares on the same EPA violation measures. Massachusetts systems
- Check whether PFAS was detected at this system under UCMR5 testing. PFAS guide
- Find and compare another public water system by name or PWSID. Search systems
EPA SDWIS and UCMR5 figures are informational only, not a substitute for a certified lab test of your own tap water.