Community Water System · PWS 080890010
Towaoc Water System
Operator location Towoac, EPA Region 8 — Tribal Water Systems - upper-third violation load (> 74 violations) with 98 EPA violations; surface water source; 2,020 served (PWS-level, not municipal population).
- 2,020
- People served (this PWS)
- 98
- EPA violations (this PWS)
- 7
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Towaoc Water System standing, high SDWIS violation third
98 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 7% is middle-third health share (≤ 23%). Population rank #13,454 of 29,740 among systems serving 500+.
The verdict
Towaoc Water System sits in the upper third of the sitemap cohort by violation count (98), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is mid-pack at 2,020 (mid served population (≤ 3,309)). Health-based share is 7% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- #13,454 of 29,740
- Population · /systems
- #22 of 55
- Population · 08
- 98
- Total EPA violations on record
- 7%
- 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
- Native American
- Connections
- 670
- School/Daycare
- No
- MCL Violations
- 7
- Monitoring Violations
- 80
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 32 | 2012 |
| Consumer Confidence Rule | Other | 8 | 2023 |
| Total Haloacetic Acids (HAA5) | MR | 6 | 2022 |
| Lead and Copper Rule | MR | 6 | 2024 |
| TTHM | MR | 5 | 2022 |
| Asbestos | MR | 4 | 2011 |
| Surface Water Treatment Rule | MR | 4 | 2023 |
| Coliform (TCR) | MCL | 4 | 2002 |
| Revised Total Coliform Rule | MON | 3 | 2023 |
| TTHM | MCL | 3 | 2025 |
| Revised Total Coliform Rule | RPT | 2 | 2023 |
| Arsenic | MR | 2 | 1983 |
| Cadmium | MR | 2 | 1983 |
| Nitrate | MR | 2 | 1983 |
| Chromium | MR | 2 | 1983 |
| Barium | MR | 2 | 1983 |
| Fluoride | MR | 2 | 1983 |
| Mercury | MR | 2 | 1983 |
| Selenium | MR | 2 | 1983 |
| Stage 2 Disinfectants and Disinfection Byproducts Rule | MR | 1 | 2010 |
| Combined Radium (-226 and -228) | MR | 1 | 1976 |
| Gross Alpha, Excl. Radon and U | MR | 1 | 1976 |
| 2,4,5-TP | MR | 1 | 1983 |
Violation Count vs. the National Corpus
Towaoc Water System has 98 recorded EPA violations, 73% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 27% carry more. 7% of this system's own violations are health-based (7 of 98), and it ranks #13,454 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)
98 Around the middle fewer violations than 27% 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 Towaoc Water System
98 violations on record for 080890010; use EPA SDWIS to confirm return-to-compliance dates and monitoring categories.
Sources: EPA SDWIS
Nationwide peers
98 violations · 2,020 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 Towaoc Water System
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in EPA Region 8 — Tribal Water Systems compares on the same EPA violation measures. EPA Region 8 — Tribal Water Systems 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.