Community Water System · PWS OH3801512
Walnut Creek Water Co.
Operator location Walnut Creek, Ohio - upper-third violation load (> 74 violations) with 322 EPA violations; groundwater source; 1,270 served (PWS-level, not municipal population).
- 1,270
- People served (this PWS)
- 322
- EPA violations (this PWS)
- 9
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Walnut Creek Water Co. standing, high SDWIS violation third
322 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 3% is middle-third health share (≤ 23%). Population rank #17,354 of 29,740 among systems serving 500+.
The verdict
Walnut Creek Water Co. sits in the upper third of the sitemap cohort by violation count (322), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is mid-pack at 1,270 (mid served population (≤ 3,309)). Health-based share is 3% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- #17,354 of 29,740
- Population · /systems
- #556 of 931
- Population · OH
- 322
- Total EPA violations on record
- 3%
- 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
- Private
- Connections
- 396
- County
- Holmes
- School/Daycare
- No
- MCL Violations
- 5
- Monitoring Violations
- 302
- Treatment Tech Violations
- 4
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Chromium | MR | 10 | 2003 |
| Mercury | MR | 10 | 2003 |
| Fluoride | MR | 10 | 2003 |
| Selenium | MR | 10 | 2003 |
| Cadmium | MR | 10 | 2003 |
| Barium | MR | 10 | 2003 |
| Coliform (TCR) | MR | 8 | 1995 |
| Arsenic | MR | 8 | 2003 |
| Antimony, Total | MR | 7 | 2003 |
| Beryllium, Total | MR | 7 | 2003 |
| Nickel | MR | 7 | 2003 |
| Nitrate | MR | 7 | 2003 |
| Thallium, Total | MR | 7 | 2003 |
| Lead and Copper Rule | MR | 5 | 2011 |
| Coliform (TCR) | MCL | 5 | 2012 |
| Methoxychlor | MR | 4 | 1994 |
| Dalapon | MR | 4 | 1994 |
| Endothall | MR | 4 | 1994 |
| Di(2-ethylhexyl) adipate | MR | 4 | 1994 |
| OXAMYL | MR | 4 | 1994 |
| Dinoseb | MR | 4 | 1994 |
| Aldicarb sulfoxide | MR | 4 | 1994 |
| Aldicarb sulfone | MR | 4 | 1994 |
| Carbofuran | MR | 4 | 1994 |
| LASSO | MR | 4 | 1994 |
| Heptachlor epoxide | MR | 4 | 1994 |
| 2,4,5-TP | MR | 4 | 1994 |
| HEXACHLOROBENZENE | MR | 4 | 1994 |
| Pentachlorophenol | MR | 4 | 1994 |
| Total Polychlorinated Biphenyls (PCB) | MR | 4 | 1994 |
Violation Count vs. the National Corpus
Walnut Creek Water Co. has 322 recorded EPA violations, 92% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 8% carry more. 3% of this system's own violations are health-based (9 of 322), and it ranks #17,354 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)
322 Higher than most more violations than 92% 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 Walnut Creek Water Co.
322 violations on record for OH3801512; use EPA SDWIS to confirm return-to-compliance dates and monitoring categories.
Sources: EPA SDWIS · Ohio EPA, Division of Drinking and Ground Waters
Nationwide peers
322 violations · 1,270 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 Walnut Creek Water Co.
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Ohio compares on the same EPA violation measures. Ohio 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.