Community Water System · PWS WI2650128
Fontana Water Utility
Operator location Fontana, Wisconsin - upper-third violation load (> 74 violations) with 252 EPA violations; groundwater source; 1,839 served (PWS-level, not municipal population).
- 1,839
- People served (this PWS)
- 252
- EPA violations (this PWS)
- 23
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Fontana Water Utility standing, high SDWIS violation third
252 EPA SDWIS violations on record - upper-third violation load (> 74 violations). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 9% is middle-third health share (≤ 23%). Population rank #14,273 of 29,740 among systems serving 500+.
The verdict
Fontana Water Utility sits in the upper third of the sitemap cohort by violation count (252), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is mid-pack at 1,839 (mid served population (≤ 3,309)). Health-based share is 9% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- #14,273 of 29,740
- Population · /systems
- #286 of 744
- Population · WI
- 252
- Total EPA violations on record
- 9%
- Health-based (MCL / treatment failure)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 681
- County
- Walworth
- School/Daycare
- No
- MCL Violations
- 22
- Monitoring Violations
- 199
- Treatment Tech Violations
- 1
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Consumer Confidence Rule | Other | 19 | 2021 |
| Coliform (TCR) | MR | 9 | 2000 |
| Nitrate | MR | 9 | 2003 |
| Nitrate | MCL | 9 | 1999 |
| Nitrate-Nitrite | MCL | 9 | 1998 |
| TTHM | MR | 7 | 2019 |
| Total Haloacetic Acids (HAA5) | MR | 7 | 2019 |
| Coliform (TCR) | MCL | 4 | 1999 |
| 1,2,4-Trichlorobenzene | MR | 3 | 1999 |
| Vinyl chloride | MR | 3 | 1999 |
| trans-1,2-Dichloroethylene | MR | 3 | 1999 |
| 1,2-Dichloropropane | MR | 3 | 1999 |
| 1,1,2-Trichloroethane | MR | 3 | 1999 |
| Trichloroethylene | MR | 3 | 1999 |
| Ethylbenzene | MR | 3 | 1999 |
| Carbon tetrachloride | MR | 3 | 1999 |
| p-Dichlorobenzene | MR | 3 | 1999 |
| cis-1,2-Dichloroethylene | MR | 3 | 1999 |
| Arsenic | MR | 3 | 1999 |
| Fluoride | MR | 3 | 1999 |
| Nitrate-Nitrite | MR | 3 | 1999 |
| Selenium | MR | 3 | 1999 |
| Beryllium, Total | MR | 3 | 1999 |
| Thallium, Total | MR | 3 | 1999 |
| Nickel | MR | 3 | 1999 |
| Mercury | MR | 3 | 1999 |
| Chromium | MR | 3 | 1999 |
| Public Notice | Other | 3 | 2024 |
| o-Dichlorobenzene | MR | 3 | 1999 |
| CHLOROBENZENE | MR | 3 | 1999 |
Violation Count vs. the National Corpus
Fontana Water Utility has 252 recorded EPA violations, 88% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 12% carry more. 9% of this system's own violations are health-based (23 of 252), and it ranks #14,273 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)
252 Higher than most more violations than 88% 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
SDWIS compliance record for Fontana Water Utility
252 violations on record for WI2650128; use EPA SDWIS to confirm return-to-compliance dates and monitoring categories.
Sources: EPA SDWIS · Wisconsin DNR, Drinking Water and Groundwater
Nationwide peers
252 violations · 1,839 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 near this population served
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Fontana Water Utility
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Wisconsin compares on the same EPA violation measures. Wisconsin 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.