Community Water System · PWS 090600125
Chemehuevi Water
Operator location Havasu Lake, EPA Region 9 — Tribal Water Systems - larger served population (> 3,309) at 4,400 people served; 65 SDWIS violations on record from groundwater sources.
- 4,400
- People served (this PWS) Larger third of systems
- 65
- EPA violations (this PWS) Middle third of systems
- 9
- Health-based (this PWS) Middle third by health-based share
- Untested
- UCMR5 (this PWS) No UCMR5 result
Chemehuevi Water standing, mid SDWIS violation third
4,400 people served (SDWIS) - larger served population (> 3,309). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 14% is middle-third health share (≤ 23%). Population rank #8,361 of 29,740 among systems serving 500+.
The verdict
Chemehuevi Water lands in the middle third by violation volume (65), large enough for peer comparisons without matching the fleet's heaviest ledgers. Population served is large (4,400; larger served population (> 3,309)), so household exposure scale sits behind the violation mix. Health-based share is 14% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- #8,361 of 29,740
- Population · /systems
- #33 of 129
- Population · 09
- 65
- Total EPA violations on record
- 14%
- 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
- Native American
- Connections
- 603
- School/Daycare
- No
- MCL Violations
- 9
- Monitoring Violations
- 27
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MCL | 9 | 1998 |
| Coliform (TCR) | MR | 7 | 1996 |
| Nitrate | MR | 4 | 2021 |
| TTHM | MR | 3 | 2006 |
| Total Haloacetic Acids (HAA5) | MR | 3 | 2006 |
| CYANIDE | MR | 2 | 1996 |
| Antimony, Total | MR | 2 | 1996 |
| Beryllium, Total | MR | 2 | 1996 |
| Thallium, Total | MR | 2 | 1996 |
| Nitrate-Nitrite | MR | 1 | 1996 |
| Consumer Confidence Rule | Other | 1 | 2006 |
| Radium-226 | MR | 1 | 2002 |
Violation Count vs. the National Corpus
Chemehuevi Water has 65 recorded EPA violations, 63% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 36% carry more. 14% of this system's own violations are health-based (9 of 65), and it ranks #8,361 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)
65 Around the middle fewer violations than 36% 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
Chemehuevi Water 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
Population served record for Chemehuevi Water
EPA SDWIS lists 4,400 people served and 603 connections for this PWS, confirm the service-area footprint on the federal report before comparing to municipal census totals.
Sources: EPA SDWIS
Nationwide peers
65 violations · 4,400 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 Chemehuevi Water
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.
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.