31 GRIST MILL RD
PWS ID: CT0419221 · OLD LYME, Connecticut 06371
Population Served
30
Total Violations
636
Health-Based Violations
28
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Private
- Connections
- 14
- County
- Middlesex
- School/Daycare
- No
- MCL Violations
- 20
- Monitoring Violations
- 551
- Treatment Tech Violations
- 8
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| E. COLI | MR | 79 | 2021 |
| Revised Total Coliform Rule | MON | 32 | 2021 |
| Public Notice | Other | 30 | 2020 |
| Lead and Copper Rule | MR | 16 | 2023 |
| Coliform (TCR) | MCL | 12 | 2015 |
| Combined Radium (-226 and -228) | MR | 12 | 2021 |
| Tritium | MR | 12 | 2017 |
| Arsenic | MR | 9 | 2017 |
| Barium | MR | 9 | 2017 |
| Chromium | MR | 9 | 2017 |
| Fluoride | MR | 9 | 2017 |
| Mercury | MR | 9 | 2017 |
| Nickel | MR | 9 | 2017 |
| Antimony, Total | MR | 9 | 2017 |
| Beryllium, Total | MR | 9 | 2017 |
| Thallium, Total | MR | 9 | 2017 |
| Selenium | MR | 9 | 2017 |
| Cadmium | MR | 9 | 2017 |
| CYANIDE | MR | 9 | 2017 |
| Coliform (TCR) | MR | 8 | 2015 |
| Methoxychlor | MR | 8 | 2017 |
| Dalapon | MR | 8 | 2017 |
| Simazine | MR | 8 | 2017 |
| Di(2-ethylhexyl) phthalate | MR | 8 | 2017 |
| Picloram | MR | 8 | 2017 |
| Hexachlorocyclopentadiene | MR | 8 | 2017 |
| Aldicarb sulfoxide | MR | 8 | 2017 |
| Aldicarb sulfone | MR | 8 | 2017 |
| Carbofuran | MR | 8 | 2017 |
| Atrazine | MR | 8 | 2017 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.