Community Water System · PWS WA5317050
Custer Water Association
Operator location Custer, Washington - smaller served population (≤ 999) at 365 people served; 77 SDWIS violations on record from groundwater sources.
- 365
- People served (this PWS)
- 77
- EPA violations (this PWS)
- 4
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Custer Water Association standing, high SDWIS violation third
365 people served (SDWIS) - smaller served population (≤ 999). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 5% is middle-third health share (≤ 23%).
The verdict
Custer Water Association sits in the upper third of the sitemap cohort by violation count (77), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (365; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 5% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- 77
- Total EPA violations on record
- 5%
- Health-based (MCL / treatment failure)
- 365
- 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
- Private
- Connections
- 239
- County
- Whatcom
- School/Daycare
- No
- MCL Violations
- 4
- Monitoring Violations
- 66
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Lead and Copper Rule | MR | 12 | 2006 |
| Nitrate | MR | 8 | 2007 |
| Consumer Confidence Rule | Other | 7 | 2017 |
| Barium | MR | 4 | 2005 |
| Cadmium | MR | 4 | 2005 |
| Mercury | MR | 4 | 2005 |
| Selenium | MR | 4 | 2005 |
| Fluoride | MR | 4 | 2005 |
| Arsenic | MR | 4 | 2005 |
| Coliform (TCR) | MCL | 4 | 1998 |
| Chromium | MR | 4 | 2005 |
| Antimony, Total | MR | 3 | 2005 |
| Beryllium, Total | MR | 3 | 2005 |
| Thallium, Total | MR | 3 | 2005 |
| Nickel | MR | 3 | 2005 |
| CYANIDE | MR | 3 | 2005 |
| Coliform (TCR) | MR | 2 | 1992 |
| Gross Alpha, Excl. Radon and U | MR | 1 | 1979 |
Violation Count vs. the National Corpus
Custer Water Association has 77 recorded EPA violations, 67% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 32% carry more. 5% of this system's own violations are health-based (4 of 77), 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)
77 Around the middle fewer violations than 32% 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 Custer Water Association
EPA SDWIS lists 365 people served and 239 connections for this PWS, confirm the service-area footprint on the federal report before comparing to municipal census totals.
Sources: EPA SDWIS · Washington State Department of Health, Office of Drinking Water
Nationwide peers
77 violations · 365 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.
What to do with Custer Water Association
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Washington compares on the same EPA violation measures. Washington 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.