Community Water System · PWS 090400008
Charco 27
Operator location Sells, EPA Region 9 — Tribal Water Systems - smaller served population (≤ 999) at 70 people served; 39 SDWIS violations on record from groundwater sources.
- 70
- People served (this PWS)
- 39
- EPA violations (this PWS)
- 1
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Charco 27 standing, mid SDWIS violation third
70 people served (SDWIS) - smaller served population (≤ 999). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 3% is middle-third health share (≤ 23%).
The verdict
Charco 27 lands in the middle third by violation volume (39), large enough for peer comparisons without matching the fleet's heaviest ledgers. Population served is smaller (70; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 3% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- 39
- Total EPA violations on record
- 3%
- Health-based (MCL / treatment failure)
- 70
- People served by this PWS (SDWIS)
- N/A
- PFAS compounds detected (UCMR5)
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
- 19
- School/Daycare
- No
- MCL Violations
- 1
- Monitoring Violations
- 33
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Nitrate | MR | 3 | 2017 |
| BHC-GAMMA | MR | 1 | 2004 |
| Methoxychlor | MR | 1 | 2004 |
| Dalapon | MR | 1 | 2004 |
| OXAMYL | MR | 1 | 2004 |
| Simazine | MR | 1 | 2004 |
| Di(2-ethylhexyl) phthalate | MR | 1 | 2004 |
| Picloram | MR | 1 | 2004 |
| Atrazine | MR | 1 | 2004 |
| Heptachlor | MR | 1 | 2004 |
| Heptachlor epoxide | MR | 1 | 2004 |
| Pentachlorophenol | MR | 1 | 2004 |
| Total Polychlorinated Biphenyls (PCB) | MR | 1 | 2004 |
| Chlordane | MR | 1 | 2004 |
| Coliform (TCR) | MCL | 1 | 2000 |
| Coliform (TCR) | MR | 1 | 2004 |
| Carbofuran | MR | 1 | 2004 |
| Dinoseb | MR | 1 | 2004 |
| Toxaphene | MR | 1 | 2004 |
| 2,4,5-TP | MR | 1 | 2004 |
| Benzo(a)pyrene | MR | 1 | 2004 |
| Glyphosate | MR | 1 | 2004 |
| LASSO | MR | 1 | 2004 |
| Endrin | MR | 1 | 2004 |
| Hexachlorocyclopentadiene | MR | 1 | 2004 |
| Diquat | MR | 1 | 2004 |
| Endothall | MR | 1 | 2004 |
| 2,4-D | MR | 1 | 2004 |
| Asbestos | MR | 1 | 2004 |
| Di(2-ethylhexyl) adipate | MR | 1 | 2004 |
Violation Count vs. the National Corpus
Charco 27 has 39 recorded EPA violations, 50% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 50% carry more. 3% of this system's own violations are health-based (1 of 39), and it ranks unranked by population served among that same cohort.
EPA violations vs. the national water-system corpus
Public water systems serving 500+ people (EPA SDWIS)
39 Lower than most fewer violations than 50% 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
Population served record for Charco 27
EPA SDWIS lists 70 people served and 19 connections for this PWS, confirm the service-area footprint on the federal report before comparing to municipal census totals.
Sources: EPA SDWIS
Nationwide peers
39 violations · 70 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.
What to do with Charco 27
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in EPA Region 9 — Tribal Water Systems compares on the same EPA violation measures. EPA Region 9 — 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.