HADDAM-KILLINGWORTH HIGH SCHOOL
PWS ID: CT0610563 · KILLINGWORTH, Connecticut 06419
Population Served
642
Total Violations
85
Health-Based Violations
21
Water Source
Groundwater
System Details
- System Type
- Non-Transient Non-Community
- Owner Type
- Local
- Connections
- 1
- County
- Middlesex
- School/Daycare
- Yes
- MCL Violations
- 17
- Monitoring Violations
- 58
- Treatment Tech Violations
- 4
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MCL | 17 | 2013 |
| E. COLI | MR | 8 | 2016 |
| Revised Total Coliform Rule | MON | 8 | 2017 |
| Coliform (TCR) | MR | 7 | 2011 |
| Revised Total Coliform Rule | TT | 4 | 2018 |
| Lead and Copper Rule | MR | 4 | 2014 |
| Revised Total Coliform Rule | RPT | 4 | 2018 |
| Methoxychlor | MR | 1 | 2005 |
| Dalapon | MR | 1 | 2005 |
| Glyphosate | MR | 1 | 2005 |
| Di(2-ethylhexyl) phthalate | MR | 1 | 2005 |
| Aldicarb sulfoxide | MR | 1 | 2005 |
| Aldicarb sulfone | MR | 1 | 2005 |
| Atrazine | MR | 1 | 2005 |
| Heptachlor | MR | 1 | 2005 |
| 2,4-D | MR | 1 | 2005 |
| Pentachlorophenol | MR | 1 | 2005 |
| 1,2-DIBROMO-3-CHLOROPROPANE | MR | 1 | 2005 |
| Chlordane | MR | 1 | 2005 |
| Toxaphene | MR | 1 | 2005 |
| OXAMYL | MR | 1 | 2005 |
| Endrin | MR | 1 | 2005 |
| Di(2-ethylhexyl) adipate | MR | 1 | 2005 |
| 2,4,5-TP | MR | 1 | 2005 |
| Heptachlor epoxide | MR | 1 | 2005 |
| Dinoseb | MR | 1 | 2005 |
| Diquat | MR | 1 | 2005 |
| Total Polychlorinated Biphenyls (PCB) | MR | 1 | 2005 |
| Aldicarb | MR | 1 | 2005 |
| HEXACHLOROBENZENE | MR | 1 | 2005 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.