Community Water System · PWS OK1021304
Barnsdall
Operator location Barnsdall, Oklahoma - 79% of 2,431 violations are health-based (upper-third health share (> 23%)); surface water source; 1,243 served per SDWIS.
- 1,243
- People served (this PWS) Middle third of systems
- 2,431
- EPA violations (this PWS) Upper third of systems
- 1,929
- Health-based (this PWS) Upper third by health-based share
- Untested
- UCMR5 (this PWS) No UCMR5 result
Barnsdall standing, high SDWIS violation third
79% of 2,431 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 79% is upper-third health share (> 23%). Population rank #17,523 of 29,740 among systems serving 500+.
The verdict
Barnsdall sits in the upper third of the sitemap cohort by violation count (2,431), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is mid-pack at 1,243 (mid served population (≤ 3,309)). Health-based share is 79% - most of this ledger is MCL or treatment-technique exceedance. No UCMR5 PFAS test appears for this system in this extract.
- #17,523 of 29,740
- Population · /systems
- #342 of 558
- Population · OK
- 2,431
- Total EPA violations on record
- 79%
- Health-based (MCL / treatment failure)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
Based on EPA SDWIS violation history and UCMR5 PFAS testing only, not water taste, odor, infrastructure age, or contaminants outside the federally tracked set.
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 502
- County
- Osage
- School/Daycare
- No
- MCL Violations
- 1,055
- Monitoring Violations
- 449
- Treatment Tech Violations
- 874
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| TTHM | MCL | 628 | 2025 |
| CARBON, TOTAL | TT | 555 | 2025 |
| Total Haloacetic Acids (HAA5) | MCL | 422 | 2023 |
| Interim Enhanced Surface Water Treatment Rule | MR | 171 | 2024 |
| Interim Enhanced Surface Water Treatment Rule | TT | 168 | 2025 |
| Surface Water Treatment Rule | TT | 149 | 2025 |
| Total Haloacetic Acids (HAA5) | MR | 65 | 2025 |
| TTHM | MR | 63 | 2025 |
| Chlorine | MR | 33 | 2024 |
| Coliform (TCR) | MR | 28 | 2015 |
| CARBON, TOTAL | MR | 28 | 2023 |
| Lead and Copper Rule | MR | 20 | 2024 |
| Nitrate-Nitrite | MR | 20 | 2018 |
| Revised Total Coliform Rule | MON | 18 | 2024 |
| Coliform (TCR) | MCL | 5 | 2005 |
| Consumer Confidence Rule | Other | 4 | 2017 |
| Surface Water Treatment Rule | MR | 3 | 2002 |
| LEAD AND COPPER RULE REVISIONS | RPT | 2 | 2024 |
| LEAD AND COPPER RULE REVISIONS | TT | 2 | 2024 |
Violation Count vs. the National Corpus
Barnsdall has 2,431 recorded EPA violations, 100% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 0% carry more. 79% of this system's own violations are health-based (1,929 of 2,431), and it ranks #17,523 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)
2,431 Higher than most more violations than 99%+ 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
How many violations vs. how serious, among peer systems
Barnsdall plotted against 29 peer public water systems (500+ people served), by total violation count (x) and the share of those violations that are health-based (y). The crosshair sits at this sample's own median on each axis. A high violation count does not automatically mean a serious record: most monitoring and reporting violations are minor, not health-based.
Violation volume vs. health-based share
Health-based violations on Barnsdall
1,929 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for OK1021304.
Sources: EPA SDWIS
Nationwide peers
2,431 violations · 1,243 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 Barnsdall
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.
Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.