Community Water System · PWS OR4100915
Union, City Of
Operator location Union, Oregon - 36% of 28 violations are health-based (upper-third health share (> 23%)); groundwater source; 2,162 served per SDWIS.
- 2,162
- People served (this PWS)
- 28
- EPA violations (this PWS)
- 10
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Union, City Of standing, mid SDWIS violation third
36% of 28 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 36% is upper-third health share (> 23%). Population rank #12,983 of 29,740 among systems serving 500+.
The verdict
Union, City Of lands in the middle third by violation volume (28), large enough for peer comparisons without matching the fleet's heaviest ledgers. Population served is mid-pack at 2,162 (mid served population (≤ 3,309)). Health-based share is 36% - most of this ledger is MCL or treatment-technique exceedance. No UCMR5 PFAS test appears for this system in this extract.
- #12,983 of 29,740
- Population · /systems
- #160 of 373
- Population · OR
- 28
- Total EPA violations on record
- 36%
- 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
- 958
- County
- Union
- School/Daycare
- No
- MCL Violations
- 10
- Monitoring Violations
- 11
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MCL | 10 | 2015 |
| Coliform (TCR) | MR | 4 | 2011 |
| Nitrate | MR | 3 | 2002 |
| Consumer Confidence Rule | Other | 2 | 2023 |
| Lead and Copper Rule | MR | 1 | 1994 |
| Public Notice | Other | 1 | 2015 |
| Combined Radium (-226 and -228) | MR | 1 | 1976 |
| Gross Alpha, Excl. Radon and U | MR | 1 | 1976 |
| Revised Total Coliform Rule | MON | 1 | 2020 |
Violation Count vs. the National Corpus
Union, City Of has 28 recorded EPA violations, 40% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 59% carry more. 36% of this system's own violations are health-based (10 of 28), and it ranks #12,983 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)
28 Lower than most fewer violations than 59% 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 Union, City Of
10 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for OR4100915.
Sources: EPA SDWIS
Nationwide peers
28 violations · 2,162 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 near this population served
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Union, City Of
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.