YORK TOWNSHIP WATER SYSTEM
PWS ID: IL0430010 · DARIEN, Illinois 60561
Population Served
1,423
Total Violations
172
Health-Based Violations
24
Water Source
Surface Water
System Details
- System Type
- Community
- Owner Type
- Private
- Connections
- 480
- County
- DuPage
- School/Daycare
- No
- MCL Violations
- 18
- Monitoring Violations
- 133
- Treatment Tech Violations
- 6
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 27 | 2000 |
| Coliform (TCR) | MCL | 18 | 2007 |
| Consumer Confidence Rule | Other | 10 | 2025 |
| Lead and Copper Rule | MR | 9 | 2012 |
| Lead and Copper Rule | TT | 6 | 2009 |
| Public Notice | Other | 4 | 2008 |
| Nitrate | MR | 4 | 2011 |
| BHC-GAMMA | MR | 3 | 1994 |
| Toxaphene | MR | 3 | 1994 |
| Carbofuran | MR | 3 | 1994 |
| Atrazine | MR | 3 | 1994 |
| Heptachlor epoxide | MR | 3 | 1994 |
| 2,4-D | MR | 3 | 1994 |
| Pentachlorophenol | MR | 3 | 1994 |
| 1,2-DIBROMO-3-CHLOROPROPANE | MR | 3 | 1994 |
| Chlordane | MR | 3 | 1994 |
| Endothall | MR | 3 | 1994 |
| Di(2-ethylhexyl) adipate | MR | 3 | 1994 |
| Di(2-ethylhexyl) phthalate | MR | 3 | 1994 |
| Picloram | MR | 3 | 1994 |
| Aldicarb sulfoxide | MR | 3 | 1994 |
| Aldicarb sulfone | MR | 3 | 1994 |
| Aldicarb | MR | 3 | 1994 |
| Hexachlorocyclopentadiene | MR | 3 | 1994 |
| Total Polychlorinated Biphenyls (PCB) | MR | 3 | 1994 |
| Dalapon | MR | 3 | 1994 |
| ETHYLENE DIBROMIDE | MR | 3 | 1994 |
| Benzo(a)pyrene | MR | 3 | 1994 |
| Diquat | MR | 3 | 1994 |
| Heptachlor | MR | 3 | 1994 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.