Community Water System · PWS OK1021504
Chelsea Economic Dev. Auth.
Operator location Chelsea, Oklahoma - upper-third violation load (> 74 violations) with 203 EPA violations; surface water source; 1,964 served (PWS-level, not municipal population).
- 1,964
- People served (this PWS)
- 203
- EPA violations (this PWS)
- 29
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Chelsea Economic Dev. Auth. standing, high SDWIS violation third
203 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 14% is middle-third health share (≤ 23%). Population rank #13,809 of 29,740 among systems serving 500+.
The verdict
Chelsea Economic Dev. Auth. sits in the upper third of the sitemap cohort by violation count (203), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is mid-pack at 1,964 (mid served population (≤ 3,309)). Health-based share is 14% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- #13,809 of 29,740
- Population · /systems
- #251 of 558
- Population · OK
- 203
- Total EPA violations on record
- 14%
- 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
- 1,117
- County
- Rogers
- School/Daycare
- No
- MCL Violations
- 25
- Monitoring Violations
- 157
- Treatment Tech Violations
- 4
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Total Haloacetic Acids (HAA5) | MCL | 25 | 2009 |
| CARBON, TOTAL | MR | 20 | 2008 |
| Nitrate-Nitrite | MR | 12 | 2016 |
| Lead and Copper Rule | MR | 9 | 2013 |
| TTHM | MR | 8 | 2008 |
| Total Haloacetic Acids (HAA5) | MR | 8 | 2008 |
| Coliform (TCR) | MR | 8 | 2014 |
| Surface Water Treatment Rule | TT | 4 | 1999 |
| Arsenic | MR | 4 | 2007 |
| cis-1,2-Dichloroethylene | MR | 4 | 2014 |
| DICHLOROMETHANE | MR | 4 | 2014 |
| p-Dichlorobenzene | MR | 4 | 2014 |
| 1,1-Dichloroethylene | MR | 4 | 2014 |
| 1,1,1-Trichloroethane | MR | 4 | 2014 |
| Carbon tetrachloride | MR | 4 | 2014 |
| 1,1,2-Trichloroethane | MR | 4 | 2014 |
| Tetrachloroethylene | MR | 4 | 2014 |
| CHLOROBENZENE | MR | 4 | 2014 |
| Benzene | MR | 4 | 2014 |
| Ethylbenzene | MR | 4 | 2014 |
| Styrene | MR | 4 | 2014 |
| Interim Enhanced Surface Water Treatment Rule | MR | 4 | 2019 |
| Toluene | MR | 4 | 2014 |
| o-Dichlorobenzene | MR | 4 | 2014 |
| 1,2-Dichloroethane | MR | 4 | 2014 |
| trans-1,2-Dichloroethylene | MR | 4 | 2014 |
| 1,2,4-Trichlorobenzene | MR | 4 | 2014 |
| 1,2-Dichloropropane | MR | 4 | 2014 |
| Xylenes, Total | MR | 4 | 2014 |
| Vinyl chloride | MR | 4 | 2014 |
Violation Count vs. the National Corpus
Chelsea Economic Dev. Auth. has 203 recorded EPA violations, 86% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 14% carry more. 14% of this system's own violations are health-based (29 of 203), and it ranks #13,809 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)
203 Higher than most more violations than 86% 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 Chelsea Economic Dev. Auth.
203 violations on record for OK1021504; use EPA SDWIS to confirm return-to-compliance dates and monitoring categories.
Sources: EPA SDWIS
Nationwide peers
203 violations · 1,964 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 Chelsea Economic Dev. Auth.
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Oklahoma compares on the same EPA violation measures. Oklahoma 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.