Community Water System · PWS IA2417018
Charter Oak Water Supply
Operator location Charter Oak, Iowa - smaller served population (≤ 999) at 522 people served; 183 SDWIS violations on record from groundwater sources.
- 522
- People served (this PWS)
- 183
- EPA violations (this PWS)
- 22
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Charter Oak Water Supply standing, high SDWIS violation third
522 people served (SDWIS) - smaller served population (≤ 999). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 12% is middle-third health share (≤ 23%). Population rank #28,110 of 29,740 among systems serving 500+.
The verdict
Charter Oak Water Supply sits in the upper third of the sitemap cohort by violation count (183), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (522; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 12% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- #28,110 of 29,740
- Population · /systems
- #528 of 545
- Population · IA
- 183
- Total EPA violations on record
- 12%
- 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
- 306
- County
- Crawford
- School/Daycare
- No
- MCL Violations
- 22
- Monitoring Violations
- 110
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Nitrate | MR | 20 | 1994 |
| Coliform (TCR) | MCL | 14 | 2002 |
| Coliform (TCR) | MR | 10 | 2014 |
| Benzene | MCL | 8 | 1994 |
| cis-1,2-Dichloroethylene | MR | 6 | 1990 |
| DICHLOROMETHANE | MR | 6 | 1990 |
| o-Dichlorobenzene | MR | 6 | 1990 |
| Tetrachloroethylene | MR | 6 | 1990 |
| CHLOROBENZENE | MR | 6 | 1990 |
| Toluene | MR | 6 | 1990 |
| Styrene | MR | 6 | 1990 |
| 1,1,2-Trichloroethane | MR | 6 | 1990 |
| 1,2-Dichloropropane | MR | 6 | 1990 |
| trans-1,2-Dichloroethylene | MR | 6 | 1990 |
| Ethylbenzene | MR | 6 | 1990 |
| Xylenes, Total | MR | 6 | 1990 |
| TTHM | MR | 4 | 2019 |
| Total Haloacetic Acids (HAA5) | MR | 4 | 2019 |
Violation Count vs. the National Corpus
Charter Oak Water Supply has 183 recorded EPA violations, 84% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 16% carry more. 12% of this system's own violations are health-based (22 of 183), and it ranks #28,110 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)
183 Higher than most more violations than 84% 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 Charter Oak Water Supply
EPA SDWIS lists 522 people served and 306 connections for this PWS, confirm the service-area footprint on the federal report before comparing to municipal census totals.
Sources: EPA SDWIS
Nationwide peers
183 violations · 522 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 Charter Oak Water Supply
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Iowa compares on the same EPA violation measures. Iowa 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.