Community Water System · PWS WI1250087
Ridgeway Waterworks
Operator location Ridgeway, Wisconsin - smaller served population (≤ 999) at 690 people served; 245 SDWIS violations on record from groundwater sources.
- 690
- People served (this PWS)
- 245
- EPA violations (this PWS)
- 26
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Ridgeway Waterworks standing, high SDWIS violation third
690 people served (SDWIS) - smaller served population (≤ 999). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 11% is middle-third health share (≤ 23%). Population rank #24,607 of 29,740 among systems serving 500+.
The verdict
Ridgeway Waterworks sits in the upper third of the sitemap cohort by violation count (245), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (690; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 11% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- #24,607 of 29,740
- Population · /systems
- #558 of 744
- Population · WI
- 245
- Total EPA violations on record
- 11%
- 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
- 255
- County
- Iowa
- School/Daycare
- No
- MCL Violations
- 26
- Monitoring Violations
- 209
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 22 | 2003 |
| Coliform (TCR) | MCL | 18 | 2005 |
| 1,2,4-Trichlorobenzene | MR | 8 | 2003 |
| DICHLOROMETHANE | MR | 8 | 2003 |
| p-Dichlorobenzene | MR | 8 | 2003 |
| trans-1,2-Dichloroethylene | MR | 8 | 2003 |
| 1,2-Dichloroethane | MR | 8 | 2003 |
| Carbon tetrachloride | MR | 8 | 2003 |
| 1,2-Dichloropropane | MR | 8 | 2003 |
| Trichloroethylene | MR | 8 | 2003 |
| 1,1,2-Trichloroethane | MR | 8 | 2003 |
| Tetrachloroethylene | MR | 8 | 2003 |
| CHLOROBENZENE | MR | 8 | 2003 |
| Benzene | MR | 8 | 2003 |
| Toluene | MR | 8 | 2003 |
| cis-1,2-Dichloroethylene | MR | 8 | 2003 |
| Vinyl chloride | MR | 8 | 2003 |
| 1,1-Dichloroethylene | MR | 8 | 2003 |
| 1,1,1-Trichloroethane | MR | 8 | 2003 |
| Styrene | MR | 8 | 2003 |
| Radium-228 | MR | 8 | 2009 |
| o-Dichlorobenzene | MR | 8 | 2003 |
| Combined Radium (-226 and -228) | MCL | 8 | 2024 |
| Ethylbenzene | MR | 8 | 2003 |
| Xylenes, Total | MR | 8 | 2003 |
| TTHM | MR | 4 | 2015 |
| Total Haloacetic Acids (HAA5) | MR | 4 | 2015 |
| Revised Total Coliform Rule | MON | 3 | 2025 |
Violation Count vs. the National Corpus
Ridgeway Waterworks has 245 recorded EPA violations, 88% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 12% carry more. 11% of this system's own violations are health-based (26 of 245), and it ranks #24,607 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)
245 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
Population served record for Ridgeway Waterworks
EPA SDWIS lists 690 people served and 255 connections for this PWS, confirm the service-area footprint on the federal report before comparing to municipal census totals.
Sources: EPA SDWIS · Wisconsin DNR, Drinking Water and Groundwater
Nationwide peers
245 violations · 690 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 with smaller service footprints
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Ridgeway Waterworks
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.