SIASCONSET WATER DEPARTMENT
PWS ID: MA4197001 · NANTUCKET, Massachusetts 02554
Population Served
3,000
Total Violations
89
Health-Based Violations
8
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 852
- County
- Nantucket
- School/Daycare
- No
- MCL Violations
- 8
- Monitoring Violations
- 72
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MCL | 8 | 2013 |
| Nitrate | MR | 3 | 2025 |
| Methoxychlor | MR | 2 | 2024 |
| BHC-GAMMA | MR | 2 | 2024 |
| Benzo(a)pyrene | MR | 2 | 2024 |
| Diquat | MR | 2 | 2024 |
| Dinoseb | MR | 2 | 2024 |
| Glyphosate | MR | 2 | 2024 |
| Hexachlorocyclopentadiene | MR | 2 | 2024 |
| OXAMYL | MR | 2 | 2024 |
| Picloram | MR | 2 | 2024 |
| Simazine | MR | 2 | 2024 |
| Carbofuran | MR | 2 | 2024 |
| Chlordane | MR | 2 | 2024 |
| Coliform (TCR) | MR | 2 | 2013 |
| Consumer Confidence Rule | Other | 2 | 2022 |
| 2,4-D | MR | 2 | 2024 |
| Heptachlor epoxide | MR | 2 | 2024 |
| Endrin | MR | 2 | 2024 |
| 1,2-DIBROMO-3-CHLOROPROPANE | MR | 2 | 2024 |
| Di(2-ethylhexyl) adipate | MR | 2 | 2024 |
| Di(2-ethylhexyl) phthalate | MR | 2 | 2024 |
| Endothall | MR | 2 | 2024 |
| 2,3,7,8-TCDD | MR | 2 | 2024 |
| Heptachlor | MR | 2 | 2024 |
| Dalapon | MR | 2 | 2024 |
| LASSO | MR | 2 | 2024 |
| Toxaphene | MR | 2 | 2024 |
| 2,4,5-TP | MR | 2 | 2024 |
| ETHYLENE DIBROMIDE | MR | 2 | 2024 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.