CLACKAMAS RIVER WATER

Q: Is CLACKAMAS RIVER WATER water safe to drink?

CLACKAMAS RIVER WATER (PWS ID: OR4100187) has 85 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 29,918 people using Surface Water sources.

Q: What type of violations does CLACKAMAS RIVER WATER have?

CLACKAMAS RIVER WATER has 85 total violations: 4 health-based violations (MCL exceedances or treatment failures), 74 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.

Q: Has PFAS been detected in CLACKAMAS RIVER WATER water?

No. CLACKAMAS RIVER WATER was tested for PFAS under the EPA's UCMR5 monitoring program and no PFAS contamination was detected.

Q: What water source does CLACKAMAS RIVER WATER use?

CLACKAMAS RIVER WATER uses Surface Water as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.

Q: Where does this data come from?

All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.

Reviewed byPlainWater Editorial, Drinking Water Quality Editorial Team · June 4, 2026

PWS ID: OR4100187 · CLACKAMAS, Oregon 97015

CLACKAMAS RIVER WATER serves 29,918 people in CLACKAMAS, Oregon using Surface Water water sources. It has 85 recorded EPA violations, including 4 health-based violations. No PFAS contamination was detected in UCMR5 testing.

Water Quality Snapshot: CLACKAMAS RIVER WATER

CLACKAMAS RIVER WATER is a local-owned community water system that delivers drinking water to 29,918 residents in CLACKAMAS, Oregon (Clackamas County) through 9,232 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 85 total violations for this system , of which 4 (5%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 74 monitoring and reporting violations are on file. The most recent violation on record dates to 2025.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 12 violations (MR). This system was sampled under EPA's UCMR5 PFAS monitoring program and no PFAS compounds were detected above the minimum reporting level.

Across Oregon, EPA tracks 2,518 public water systems serving 4,005,242 people, with 206,659 cumulative violations and 20,339 health-based violations on record. About 99% of systems in the state carry at least one violation, and state-wide the average per system is 82.1 violations. CLACKAMAS RIVER WATER's 85 violations sit above the Oregon average. Statewide, 30 of 125 UCMR5-tested systems have reported PFAS detections (24%). All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

Population Served

29,918

Total Violations

Health-Based Violations

Water Source

Surface Water

System Details

System Type: Community
Owner Type: Local
Connections: 9,232
County: Clackamas
School/Daycare: No
MCL Violations: 4
Monitoring Violations: 74
Treatment Tech Violations: 0

Violation History

Contaminant violations recorded by EPA.

Contaminant	Category	Count	Latest
Coliform (TCR)	MR	12	2009
Nitrate	MR	6	2007
Coliform (TCR)	MCL	4	1996
Xylenes, Total	MR	2	2007
o-Dichlorobenzene	MR	2	2007
Vinyl chloride	MR	2	2007
1,1-Dichloroethylene	MR	2	2007
1,2-Dichloroethane	MR	2	2007
1,1,1-Trichloroethane	MR	2	2007
Carbon tetrachloride	MR	2	2007
Trichloroethylene	MR	2	2007
Toluene	MR	2	2007
Ethylbenzene	MR	2	2007
Styrene	MR	2	2007
cis-1,2-Dichloroethylene	MR	2	2007
1,2-Dichloropropane	MR	2	2007
Tetrachloroethylene	MR	2	2007
Benzene	MR	2	2007
Surface Water Treatment Rule	MR	2	2017
Consumer Confidence Rule	Other	2	2023
DICHLOROMETHANE	MR	2	2007
1,1,2-Trichloroethane	MR	2	2007
Lead and Copper Rule	MR	2	2025
CHLOROBENZENE	MR	2	2007
p-Dichlorobenzene	MR	2	2007
1,2,4-Trichlorobenzene	MR	2	2007
trans-1,2-Dichloroethylene	MR	2	2007
Interim Enhanced Surface Water Treatment Rule	MR	1	2017
Mercury	MR	1	1979
Combined Radium (-226 and -228)	MR	1	1976

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 120 samples detected PFAS.

Contaminant	Date	Result	MRL	Status
ADONA	8/21/2024	<0.003 µg/L	0.003 µg/L	Not Detected
PFUnA	8/21/2024	<0.002 µg/L	0.002 µg/L	Not Detected
PFTA	8/21/2024	<0.008 µg/L	0.008 µg/L	Not Detected
PFTrDA	8/21/2024	<0.007 µg/L	0.007 µg/L	Not Detected
NEtFOSAA	8/21/2024	<0.005 µg/L	0.005 µg/L	Not Detected
NMeFOSAA	8/21/2024	<0.006 µg/L	0.006 µg/L	Not Detected
lithium	8/21/2024	<9 µg/L	9 µg/L	Not Detected
PFBS	8/21/2024	<0.003 µg/L	0.003 µg/L	Not Detected
PFHpA	8/21/2024	<0.003 µg/L	0.003 µg/L	Not Detected
PFHxS	8/21/2024	<0.003 µg/L	0.003 µg/L	Not Detected
PFNA	8/21/2024	<0.004 µg/L	0.004 µg/L	Not Detected
PFOS	8/21/2024	<0.004 µg/L	0.004 µg/L	Not Detected
PFOA	8/21/2024	<0.004 µg/L	0.004 µg/L	Not Detected
PFDA	8/21/2024	<0.003 µg/L	0.003 µg/L	Not Detected
PFBA	8/21/2024	<0.005 µg/L	0.005 µg/L	Not Detected
PFHxA	8/21/2024	<0.003 µg/L	0.003 µg/L	Not Detected
PFHpS	8/21/2024	<0.003 µg/L	0.003 µg/L	Not Detected
11Cl-PF3OUdS	8/21/2024	<0.005 µg/L	0.005 µg/L	Not Detected
9Cl-PF3ONS	8/21/2024	<0.002 µg/L	0.002 µg/L	Not Detected
HFPO-DA	8/21/2024	<0.005 µg/L	0.005 µg/L	Not Detected
6:2 FTS	8/21/2024	<0.005 µg/L	0.005 µg/L	Not Detected
4:2 FTS	8/21/2024	<0.003 µg/L	0.003 µg/L	Not Detected
8:2 FTS	8/21/2024	<0.005 µg/L	0.005 µg/L	Not Detected
PFMPA	8/21/2024	<0.004 µg/L	0.004 µg/L	Not Detected
PFPeA	8/21/2024	<0.003 µg/L	0.003 µg/L	Not Detected
PFMBA	8/21/2024	<0.003 µg/L	0.003 µg/L	Not Detected
PFEESA	8/21/2024	<0.003 µg/L	0.003 µg/L	Not Detected
NFDHA	8/21/2024	<0.02 µg/L	0.02 µg/L	Not Detected
PFPeS	8/21/2024	<0.004 µg/L	0.004 µg/L	Not Detected
PFDoA	8/21/2024	<0.003 µg/L	0.003 µg/L	Not Detected
lithium	5/20/2024	<9 µg/L	9 µg/L	Not Detected
11Cl-PF3OUdS	5/20/2024	<0.005 µg/L	0.005 µg/L	Not Detected
PFTA	5/20/2024	<0.008 µg/L	0.008 µg/L	Not Detected
PFTrDA	5/20/2024	<0.007 µg/L	0.007 µg/L	Not Detected
NEtFOSAA	5/20/2024	<0.005 µg/L	0.005 µg/L	Not Detected
NMeFOSAA	5/20/2024	<0.006 µg/L	0.006 µg/L	Not Detected
PFBS	5/20/2024	<0.003 µg/L	0.003 µg/L	Not Detected
PFHpA	5/20/2024	<0.003 µg/L	0.003 µg/L	Not Detected
PFHxS	5/20/2024	<0.003 µg/L	0.003 µg/L	Not Detected
PFNA	5/20/2024	<0.004 µg/L	0.004 µg/L	Not Detected
PFOS	5/20/2024	<0.004 µg/L	0.004 µg/L	Not Detected
PFOA	5/20/2024	<0.004 µg/L	0.004 µg/L	Not Detected
PFDA	5/20/2024	<0.003 µg/L	0.003 µg/L	Not Detected
PFDoA	5/20/2024	<0.003 µg/L	0.003 µg/L	Not Detected
PFHpS	5/20/2024	<0.003 µg/L	0.003 µg/L	Not Detected
PFUnA	5/20/2024	<0.002 µg/L	0.002 µg/L	Not Detected
PFPeS	5/20/2024	<0.004 µg/L	0.004 µg/L	Not Detected
9Cl-PF3ONS	5/20/2024	<0.002 µg/L	0.002 µg/L	Not Detected
ADONA	5/20/2024	<0.003 µg/L	0.003 µg/L	Not Detected
HFPO-DA	5/20/2024	<0.005 µg/L	0.005 µg/L	Not Detected

Verify This Water System

The figures above are aggregated from EPA's public databases. To verify the underlying records — or to file a complaint, request a Consumer Confidence Report, or check current monitoring status — go directly to the federal and state regulators that enforce the Safe Drinking Water Act for CLACKAMAS RIVER WATER.

Federal Source of Truth

EPA SDWIS — Federal Reports

EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:

View PWS ID OR4100187 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Oregon Drinking Water Authority

Oregon's primacy agency administers the Safe Drinking Water Act locally. Search EPA SDWIS for the current state contact, or use the state's public health or environment department portal.

Find OR regulator via EPA SDWIS

Violation Timeline

Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.

Year (latest)	Contaminant	Category	Count	EPA Record
2025	Lead and Copper Rule	MR	2	SDWIS / OR4100187 / 5000
2023	Consumer Confidence Rule	Other	2	SDWIS / OR4100187 / 7000
2017	Surface Water Treatment Rule	MR	2	SDWIS / OR4100187 / 0200
2017	Interim Enhanced Surface Water Treatment Rule	MR	1	SDWIS / OR4100187 / 0300
2009	Coliform (TCR)	MR	12	SDWIS / OR4100187 / 3100
2007	Nitrate	MR	6	SDWIS / OR4100187 / 1040
2007	Xylenes, Total	MR	2	SDWIS / OR4100187 / 2955
2007	o-Dichlorobenzene	MR	2	SDWIS / OR4100187 / 2968
2007	Vinyl chloride	MR	2	SDWIS / OR4100187 / 2976
2007	1,1-Dichloroethylene	MR	2	SDWIS / OR4100187 / 2977
2007	1,2-Dichloroethane	MR	2	SDWIS / OR4100187 / 2980
2007	1,1,1-Trichloroethane	MR	2	SDWIS / OR4100187 / 2981
2007	Carbon tetrachloride	MR	2	SDWIS / OR4100187 / 2982
2007	Trichloroethylene	MR	2	SDWIS / OR4100187 / 2984
2007	Toluene	MR	2	SDWIS / OR4100187 / 2991

How CLACKAMAS RIVER WATER Compares

Cross-reference this system's record against state averages and the federal MCL framework for context.

Metric	CLACKAMAS RIVER WATER	Oregon avg	Federal benchmark
Total violations	85	82.1	SDWA compliance — any non-zero count is a recorded breach
Health-based violations	4	8.1	Indicates a contaminant exceeded a federal MCL
PFAS detection	None	24%	EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served	29,918	1,591	Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 2,518 regulated public water systems in Oregon.

Federal MCL reference — Safe Drinking Water Act thresholds ▼

Contaminant	Federal MCL / Action Level	Note
Lead	0 mg/L (Action Level: 0.015 mg/L)	Lead and Copper Rule treatment technique
Arsenic	0.010 mg/L (10 ppb)	Health-based MCL since 2006
Total Coliform	Treatment technique (RTCR)	Indicator organism, monitoring trigger
PFOA / PFOS (PFAS)	4.0 ppt each (final 2024 rule)	Compliance deadline 2029
Nitrate (as N)	10 mg/L	Acute health risk for infants

Frequently Asked Questions

Is CLACKAMAS RIVER WATER water safe to drink? ▼

CLACKAMAS RIVER WATER (PWS ID: OR4100187) has 85 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 29,918 people using Surface Water sources.

How many people does CLACKAMAS RIVER WATER serve? ▼

CLACKAMAS RIVER WATER serves 29,918 people in CLACKAMAS, Oregon. It is a Local-owned system using Surface Water water sources with 9,232 service connections.

What type of violations does CLACKAMAS RIVER WATER have? ▼

CLACKAMAS RIVER WATER has 85 total violations: 4 health-based violations (MCL exceedances or treatment failures), 74 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.

Has PFAS been detected in CLACKAMAS RIVER WATER water? ▼

No. CLACKAMAS RIVER WATER was tested for PFAS under the EPA's UCMR5 monitoring program and no PFAS contamination was detected.

What water source does CLACKAMAS RIVER WATER use? ▼

CLACKAMAS RIVER WATER uses Surface Water as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.

Where does this data come from? ▼

All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.

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Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. PFAS data from EPA UCMR5 monitoring program (2023-2025). This data is provided for informational purposes only.

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