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The tables below list all violations that the state reported to EPA for this water system. Health-based violations are listed first, followed by treatment technique, MRDL, monitoring, reporting, and other violations.

Health-based	Violations of maximum contaminant levels (MCLs) or maximum residual disinfectant levels (MRDLs), which specify the highest concentrations of contaminants or disinfectants, respectively, allowed in drinking water; or of treatment technique (TT) rules, which specify required processes intended to reduce the amounts of contaminants in drinking water. MCLs, MRDLs, and treatment technique rules are all health-based drinking water standards.
Maximum Contaminant Level or MCL	The highest level of a contaminant that is allowed in drinking water. MCLs are set as close to the MCLGs as feasible using the best available treatment technology.
Treatment Technique	A required process intended to reduce the level of a contaminant in drinking water.
Maximum residual disinfectant level or MRDL	The highest level of a disinfectant allowed in drinking water. There is convincing evidence that addition of a disinfectant is necessary for control of microbial contaminants.
Monitoring & reporting	Failure to conduct regular monitoring of drinking water quality, as required by SDWA, or to submit monitoring results in a timely fashion to the primacy agency or EPA.
Public notification & other	Failure to provide notification to the public as required by the Violations of Public Notification Rule and the Consumer Confidence Report Rule, and violations of other requirements such as those violations related to variances and exemptions.

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Violations

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Violation Category Code	Violation Type Description	Rule Name	Contaminant Name	Violation ID	Compliance Status Description	Compliance Period Begin Date	Compliance Period End Date	Is Health Based Ind
MR	Monitoring, Regular	Radionuclides and Revised Rad Rule	Gross Alpha, Excl. Radon and U	903218950	Known	01-OCT-2025	31-DEC-2025	No
MR	Monitoring, Regular	Radionuclides and Revised Rad Rule	Combined Uranium	903218948	Known	01-OCT-2025	31-DEC-2025	No
MR	Monitoring, Regular	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	903218949	Known	01-OCT-2025	31-DEC-2025	No
MR	Monitoring and Reporting (DBP)	Stage 2 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	903218940	Returned to Compliance	01-JAN-2025	31-MAR-2025	No
MR	Monitoring and Reporting (DBP)	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	903218939	Returned to Compliance	01-JAN-2025	31-MAR-2025	No
MR	Monitoring, Regular	Inorganic Chemicals	Cadmium	903218959	Known	01-JAN-2023	31-DEC-2025	No
MR	Monitoring, Regular	Inorganic Chemicals	Chromium	903218958	Known	01-JAN-2023	31-DEC-2025	No
MR	Monitoring, Regular	Inorganic Chemicals	Selenium	903218951	Known	01-JAN-2023	31-DEC-2025	No
MR	Monitoring, Regular	Inorganic Chemicals	Nickel	903218955	Known	01-JAN-2023	31-DEC-2025	No
MR	Monitoring, Regular	Inorganic Chemicals	Mercury	903218956	Known	01-JAN-2023	31-DEC-2025	No
MR	Monitoring, Regular	Inorganic Chemicals	CYANIDE	903218957	Known	01-JAN-2023	31-DEC-2025	No
MR	Monitoring, Regular	Inorganic Chemicals	Barium	903218960	Known	01-JAN-2023	31-DEC-2025	No
MR	Monitoring, Regular	Inorganic Chemicals	Antimony, Total	903218954	Known	01-JAN-2023	31-DEC-2025	No
MR	Monitoring, Regular	Inorganic Chemicals	Beryllium, Total	903218953	Known	01-JAN-2023	31-DEC-2025	No
MR	Monitoring, Regular	Inorganic Chemicals	Thallium, Total	903218952	Known	01-JAN-2023	31-DEC-2025	No
MR	Monitoring and Reporting (DBP)	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	903218936	Returned to Compliance	01-JUL-2020	30-SEP-2020	No
MR	Monitoring and Reporting (DBP)	Stage 2 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	903218937	Returned to Compliance	01-JUL-2020	30-SEP-2020	No
MCL	Maximum Contaminant Level Violation, Acute (TCR)	Total Coliform Rule	Coliform (TCR)	903218931	Returned to Compliance	01-NOV-2012	30-NOV-2012	Yes
MR	Monitoring, Regular	Arsenic Rule	Arsenic	3218308	Returned to Compliance	01-JAN-2005	31-DEC-2007	No
MR	Monitoring, Regular	Arsenic Rule	Arsenic	3215005	Returned to Compliance	01-JAN-2002	31-DEC-2004	No
MR	Monitoring, Routine Minor (TCR)	Total Coliform Rule	Coliform (TCR)	75495	Returned to Compliance	01-DEC-1994	31-DEC-1994	No
MR	Monitoring, Repeat Minor (TCR)	Total Coliform Rule	Coliform (TCR)	3214993	Returned to Compliance	01-JUN-1993	30-JUN-1993	No

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Enforcement Actions

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Latest Enforcement ID	Associated To Violation ID	Enforcement Action Type Code	Enforcement Action Description	Enforcement Date	Originator Description	Enforcement Comment
218	903218939	SOX	State Compliance achieved	04-JUN-2025	State	-
218	903218940	SOX	State Compliance achieved	04-JUN-2025	State	-
216	903218937	SOX	State Compliance achieved	10-NOV-2020	State	-
216	903218936	SOX	State Compliance achieved	10-NOV-2020	State	-
215	903218931	SOX	State Compliance achieved	11-JUN-2013	State	-
208	3215005	SOX	State Compliance achieved	20-JUN-2008	State	AS SNC 89321
208	3218308	SOX	State Compliance achieved	20-JUN-2008	State	AS SNC 89321
210	3214993	SOX	State Compliance achieved	30-JUL-2001	State	-
209	75495	SOX	State Compliance achieved	30-JUL-2001	State	-

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All Facilities

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Facility Name	Facility ID	Is Source	Facility Type Description	Water Type Description	Availability Description	Facility Activity Status
PORTLAND WATER BUREAU (00657)	11946	Yes	Consecutive Connection	Surface water	Emergency	Inactive
ASR WELL 3	27077	Yes	Well	Ground water	Seasonal	Active
WELL #2	2599	Yes	Well	Ground water	Seasonal	Active
ASR WELL 2	21644	Yes	Well	Ground water	Seasonal	Active
ASR WELL 1	18252	Yes	Well	Ground water	Seasonal	Active
WELL #3	2600	Yes	Well	Ground water	Other	Inactive
WELL #1 (1-2%)	2598	Yes	Well	Ground water	Other	Inactive
TUALATIN VALLEY WATER DISTRICT (00665)	12074	Yes	Consecutive Connection	Surface water	Emergency	Inactive
CITY OF BEAVERTON (00081)	18240	Yes	Consecutive Connection	Surface water	Emergency	Inactive
LAKE OSWEGO TIGARD WATER SUPPLY (01542)	25849	Yes	Consecutive Connection	Surface water	Permanent	Active
LAKE OSWEGO MUNICIPAL WATER (00457)	11945	Yes	Consecutive Connection	Surface water	Permanent	Inactive
COMMON HEADER FOR WTP-C	19437	No	Common Headers	-	-	Active
COMMON HEADER FOR WTP-D	19438	No	Common Headers	-	-	Active
COMMON HEADER FOR WTP-H	22890	No	Common Headers	-	-	Active
CH FOR WTP-I	27079	No	Common Headers	-	-	Active
COMMON HEADER FOR WTP-E	20387	No	Common Headers	-	-	Inactive
DISTRIBUTION SYSTEM	7382	No	Distribution System/Zone	-	-	Active
EP FOR LAKE OSWEGO TIGARD WATER SUPPLY	12368	No	Sampling Station	-	-	Active
EP FOR ASR WELL 1	15881	No	Sampling Station	-	-	Active
EP FOR WELL #2	15882	No	Sampling Station	-	-	Active
EP FOR ASR WELL 2	21630	No	Sampling Station	-	-	Active
EP FOR ASR WELL 3	27078	No	Sampling Station	-	-	Active
EP FOR PORTLAND WATER BUREAU	12180	No	Sampling Station	-	-	Inactive
EP FOR WELL #3	16777	No	Sampling Station	-	-	Inactive
EP FOR TUALATIN VALLEY WATER DISTRICT	16912	No	Sampling Station	-	-	Inactive
EP FOR CITY OF BEAVERTON	18241	No	Sampling Station	-	-	Inactive
TP FOR ASR WELL 2	22889	No	Treatment Plant	-	-	Active
TP FOR ASR WELL 3	27080	No	Treatment Plant	-	-	Active
TP FOR ASR WELL 1	433	No	Treatment Plant	-	-	Active
TP FOR WELL #2	434	No	Treatment Plant	-	-	Active
TP FOR WELL #3	1396	No	Treatment Plant	-	-	Inactive

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Treatment Processes

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Facility Name	Facility ID	Treatment Process	Treatment Objective
TP FOR WELL #3	1396	Innovative	Other
TP FOR ASR WELL 2	22889	Innovative	Other
TP FOR ASR WELL 3	27080	Innovative	Other
TP FOR ASR WELL 1	433	Innovative	Other
TP FOR WELL #2	434	Innovative	Other

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