Community Water System · PWS OR4100689
City of Rainier
Operator location Rainier, Oregon - 44% of 301 violations are health-based (upper-third health share (> 23%)); surface water source; 1,932 served per SDWIS.
- 1,932
- People served (this PWS)
- 301
- EPA violations (this PWS)
- 133
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
City of Rainier standing, high SDWIS violation third
44% of 301 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 44% is upper-third health share (> 23%). Population rank #13,916 of 29,740 among systems serving 500+.
The verdict
City of Rainier sits in the upper third of the sitemap cohort by violation count (301), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is mid-pack at 1,932 (mid served population (≤ 3,309)). Health-based share is 44% - most of this ledger is MCL or treatment-technique exceedance. No UCMR5 PFAS test appears for this system in this extract.
- #13,916 of 29,740
- Population · /systems
- #173 of 373
- Population · OR
- 301
- Total EPA violations on record
- 44%
- 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
- 919
- County
- Columbia
- School/Daycare
- No
- MCL Violations
- 4
- Monitoring Violations
- 163
- Treatment Tech Violations
- 129
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Surface Water Treatment Rule | TT | 129 | 2000 |
| Surface Water Treatment Rule | MR | 42 | 2024 |
| Coliform (TCR) | MR | 22 | 2014 |
| Total Haloacetic Acids (HAA5) | MR | 12 | 2024 |
| TTHM | MR | 11 | 2024 |
| Interim Enhanced Surface Water Treatment Rule | MR | 11 | 2024 |
| Revised Total Coliform Rule | MON | 5 | 2022 |
| Coliform (TCR) | MCL | 4 | 2001 |
| Xylenes, Total | MR | 4 | 2024 |
| Diquat | MR | 2 | 2018 |
| Endothall | MR | 2 | 2019 |
| Lead and Copper Rule | MR | 2 | 2024 |
| Consumer Confidence Rule | Other | 2 | 2024 |
| Glyphosate | MR | 2 | 2017 |
| Chlordane | MR | 1 | 2017 |
| Total Polychlorinated Biphenyls (PCB) | MR | 1 | 2017 |
| Pentachlorophenol | MR | 1 | 2017 |
| Benzo(a)pyrene | MR | 1 | 2017 |
| HEXACHLOROBENZENE | MR | 1 | 2017 |
| Heptachlor epoxide | MR | 1 | 2017 |
| LASSO | MR | 1 | 2017 |
| Atrazine | MR | 1 | 2017 |
| Dinoseb | MR | 1 | 2017 |
| OXAMYL | MR | 1 | 2017 |
| Di(2-ethylhexyl) adipate | MR | 1 | 2017 |
| Methoxychlor | MR | 1 | 2017 |
| Endrin | MR | 1 | 2017 |
| cis-1,2-Dichloroethylene | MR | 1 | 2024 |
| o-Dichlorobenzene | MR | 1 | 2024 |
| p-Dichlorobenzene | MR | 1 | 2024 |
Violation Count vs. the National Corpus
City of Rainier has 301 recorded EPA violations, 91% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 9% carry more. 44% of this system's own violations are health-based (133 of 301), and it ranks #13,916 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)
301 Higher than most more violations than 91% 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 City of Rainier
133 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for OR4100689.
Sources: EPA SDWIS
Nationwide peers
301 violations · 1,932 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 City of Rainier
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Oregon compares on the same EPA violation measures. Oregon 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.