OHA Drinking Water Services
OR41
PWS ID: 95757 ---- COLUMBIA BASIN ONION
Violation History

Violations are displayed for the last 5 years only.
Group Abbreviations:  LCR = Lead & Copper Rule, NO3 = Nitrate
Purple shading indicates formal enforcement.  Gray shading indicates return to compliance. 

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Violation
Number		Auto-
RTC?		Monitoring Period
Begin
End 		Facility
ID		 Analyte
Group		 Violation Type - Analyte Count
Show analytes for all violations 		Enforcement Action - Date
Show history 		Points Contact
Report
10NDec 13, 2025 Coliform Investigation Defects Not Corrected - 1 Public Notice Required 5
7NOct 01, 2025 Dec 31, 2025EP-A NO3 Chemical MCL based on 1 Sample - 1 Bilateral Compliance Agreement Signed - Mar 01, 2026 10
2NJan 01, 2025 Dec 31, 2025EP-A NO3 Chemical MCL based on Average of Samples - 1 Bilateral Compliance Agreement Signed - Mar 01, 2026 10
6NJul 01, 2025 Sep 30, 2025EP-A NO3 Chemical MCL based on 1 Sample - 1 Bilateral Compliance Agreement Signed - Mar 01, 2026 10
9NOct 01, 2025 Dec 31, 2025 NO3 Public Notice Late/Nonreporting (Viol # 7) - 1 Returned To Compliance - Feb 19, 2026 1
8NJul 01, 2025 Sep 30, 2025 NO3 Public Notice Late/Nonreporting (Viol # 6) - 1 Returned To Compliance - Feb 19, 2026 1
4NJul 13, 2025 Jul 17, 2025 Coliform Investigation Nonreporting - 1 Returned To Compliance - Jul 17, 2025 5
3YJan 01, 2025 Jun 30, 2025DIST-A LCR LCR Late/Nonreporting - 1  Show analyte Returned To Compliance - Dec 22, 2025 1
SYSTEM SCORE SUMMARY
Learn about system scores		Unaddressed Points:
Number of years the oldest violation has been unaddressed (n):
System Score:
Points under formal enforcement:
Points RTC'd: 		5
0
5
30
8

Violation history was last updated on 4/3/2026, 34 hours ago.

For questions regarding these violations contact either: