Community Water System · PWS OK3006809
Sequoyah Co. RWD #4
Operator location Sallisaw, Oklahoma - 30% of 54 violations are health-based (upper-third health share (> 23%)); surface water source; 1,750 served per SDWIS.
- 1,750
- People served (this PWS)
- 54
- EPA violations (this PWS)
- 16
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Sequoyah Co. RWD #4 standing, mid SDWIS violation third
30% of 54 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 30% is upper-third health share (> 23%). Population rank #14,702 of 29,740 among systems serving 500+.
The verdict
Sequoyah Co. RWD #4 lands in the middle third by violation volume (54), large enough for peer comparisons without matching the fleet's heaviest ledgers. Population served is mid-pack at 1,750 (mid served population (≤ 3,309)). Health-based share is 30% - most of this ledger is MCL or treatment-technique exceedance. No UCMR5 PFAS test appears for this system in this extract.
- #14,702 of 29,740
- Population · /systems
- #273 of 558
- Population · OK
- 54
- Total EPA violations on record
- 30%
- 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
- 823
- County
- Sequoyah
- School/Daycare
- No
- MCL Violations
- 16
- Monitoring Violations
- 38
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 23 | 2009 |
| TTHM | MCL | 16 | 2018 |
| TTHM | MR | 5 | 2018 |
| Revised Total Coliform Rule | MON | 4 | 2025 |
| Chlorine | MR | 4 | 2025 |
| Total Haloacetic Acids (HAA5) | MR | 2 | 2013 |
Violation Count vs. the National Corpus
Sequoyah Co. RWD #4 has 54 recorded EPA violations, 59% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 41% carry more. 30% of this system's own violations are health-based (16 of 54), and it ranks #14,702 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)
54 Around the middle fewer violations than 41% 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 Sequoyah Co. RWD #4
16 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for OK3006809.
Sources: EPA SDWIS
Nationwide peers
54 violations · 1,750 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 near this population served
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Sequoyah Co. RWD #4
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.