Community Water System · PWS OK2000501
Elk City
Operator location Elk City, Oklahoma - larger served population (> 3,309) at 10,510 people served; 56 SDWIS violations on record from groundwater sources.
- 10,510
- People served (this PWS)
- 56
- EPA violations (this PWS)
- 1
- Health-based (this PWS)
- No PFAS
- UCMR5 (this PWS)
Elk City standing, mid SDWIS violation third
10,510 people served (SDWIS) - larger served population (> 3,309). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 2% is middle-third health share (≤ 23%). UCMR5: UCMR5 tested, none detected. Population rank #4,495 of 29,740 among systems serving 500+.
The verdict
Elk City lands in the middle third by violation volume (56), large enough for peer comparisons without matching the fleet's heaviest ledgers. Population served is large (10,510; larger served population (> 3,309)), so household exposure scale sits behind the violation mix. Health-based share is 2% (middle-third health share (≤ 23%)). UCMR5 tested this system and reported no PFAS above the minimum reporting level.
- #4,495 of 29,740
- Population · /systems
- #52 of 558
- Population · OK
- 56
- Total EPA violations on record
- 2%
- 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
- 18,240
- County
- Beckham
- School/Daycare
- No
- MCL Violations
- 1
- Monitoring Violations
- 42
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Chlorine | MR | 12 | 2024 |
| Coliform (TCR) | MR | 7 | 1998 |
| Gross Alpha, Excl. Radon and U | MR | 4 | 2014 |
| Combined Uranium | MR | 4 | 2014 |
| Combined Radium (-226 and -228) | MR | 4 | 2014 |
| Gross Beta Particle Activity | MR | 4 | 2014 |
| Revised Total Coliform Rule | MON | 4 | 2023 |
| Lead and Copper Rule | MR | 3 | 1992 |
| Consumer Confidence Rule | Other | 3 | 2014 |
| Coliform (TCR) | MCL | 1 | 1994 |
Violation Count vs. the National Corpus
Elk City has 56 recorded EPA violations, 60% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 40% carry more. 2% of this system's own violations are health-based (1 of 56), and it ranks #4,495 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)
56 Around the middle fewer violations than 40% 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
PFAS Testing Results (UCMR5)
Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 58 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| PFHpS | 6/12/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| NFDHA | 6/12/2023 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFOS | 6/12/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFMBA | 6/12/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMPA | 6/12/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFTrDA | 6/12/2023 | <7.00 ppt | 7.00 ppt | Not Detected |
| NEtFOSAA | 6/12/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| NMeFOSAA | 6/12/2023 | <6.00 ppt | 6.00 ppt | Not Detected |
| PFPeA | 6/12/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBS | 6/12/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpA | 6/12/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFTA | 6/12/2023 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFUnA | 6/12/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
| 4:2 FTS | 6/12/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 8:2 FTS | 6/12/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBA | 6/12/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| HFPO-DA | 6/12/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| ADONA | 6/12/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxS | 6/12/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 6/12/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFNA | 6/12/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHxA | 6/12/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeS | 6/12/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFDoA | 6/12/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDA | 6/12/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFOA | 6/12/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| 6:2 FTS | 6/12/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| 9Cl-PF3ONS | 6/12/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFEESA | 6/12/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| HFPO-DA | 12/19/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFOA | 12/19/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHpS | 12/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeS | 12/19/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| NFDHA | 12/19/2023 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFEESA | 12/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMBA | 12/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeA | 12/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMPA | 12/19/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| 8:2 FTS | 12/19/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| 4:2 FTS | 12/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 6:2 FTS | 12/19/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFTrDA | 12/19/2023 | <7.00 ppt | 7.00 ppt | Not Detected |
| NMeFOSAA | 12/19/2023 | <6.00 ppt | 6.00 ppt | Not Detected |
| NEtFOSAA | 12/19/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| ADONA | 12/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 9Cl-PF3ONS | 12/19/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 12/19/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFUnA | 12/19/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFHxA | 12/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDoA | 12/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
Population served record for Elk City
EPA SDWIS lists 10,510 people served and 18,240 connections for this PWS, confirm the service-area footprint on the federal report before comparing to municipal census totals.
Sources: EPA SDWIS
Nationwide peers
56 violations · 10,510 served: nearest cross-state SDWIS matches.
Cross-state systems near this violation count
Nearest cross-state community systems (500+ served) by total SDWIS violations on record.
Cross-state systems with similar served population
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Elk City
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.