Community Water System · PWS OK1021417
Copan PWA
Operator location Copan, Oklahoma - 42% of 408 violations are health-based (upper-third health share (> 23%)); surface water source; 733 served per SDWIS.
- 733
- People served (this PWS)
- 408
- EPA violations (this PWS)
- 173
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Copan PWA standing, high SDWIS violation third
42% of 408 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 42% is upper-third health share (> 23%). Population rank #23,749 of 29,740 among systems serving 500+.
The verdict
Copan PWA sits in the upper third of the sitemap cohort by violation count (408), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (733; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 42% - most of this ledger is MCL or treatment-technique exceedance. No UCMR5 PFAS test appears for this system in this extract.
- #23,749 of 29,740
- Population · /systems
- #478 of 558
- Population · OK
- 408
- Total EPA violations on record
- 42%
- 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
- 357
- County
- Washington
- School/Daycare
- No
- MCL Violations
- 121
- Monitoring Violations
- 203
- Treatment Tech Violations
- 52
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| TTHM | MCL | 97 | 2025 |
| Interim Enhanced Surface Water Treatment Rule | MR | 66 | 2025 |
| CARBON, TOTAL | MR | 30 | 2024 |
| Chlorine | MR | 30 | 2024 |
| Surface Water Treatment Rule | TT | 29 | 2025 |
| Coliform (TCR) | MR | 26 | 2006 |
| TTHM | MR | 24 | 2025 |
| Total Haloacetic Acids (HAA5) | MCL | 24 | 2025 |
| Interim Enhanced Surface Water Treatment Rule | TT | 22 | 2025 |
| Total Haloacetic Acids (HAA5) | MR | 12 | 2025 |
| Revised Total Coliform Rule | MON | 8 | 2024 |
| Public Notice | Other | 6 | 2025 |
| Lead and Copper Rule | MR | 4 | 2024 |
| Surface Water Treatment Rule | MR | 3 | 1999 |
| Consumer Confidence Rule | Other | 3 | 2024 |
| LEAD AND COPPER RULE REVISIONS | TT | 1 | 2024 |
| LEAD AND COPPER RULE REVISIONS | RPT | 1 | 2024 |
Violation Count vs. the National Corpus
Copan PWA has 408 recorded EPA violations, 94% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 6% carry more. 42% of this system's own violations are health-based (173 of 408), and it ranks #23,749 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)
408 Higher than most more violations than 94% 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
Health-based violations on Copan PWA
173 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for OK1021417.
Sources: EPA SDWIS
Nationwide peers
408 violations · 733 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 Copan PWA
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.