Is Lake Oswego, Oregon tap water safe?
13 water systems report serving Lake Oswego. Your water depends on which one serves your address. Check your bill if unsure. This list is matched from the ZIP codes in this place, so it may include nearby systems.
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Portland Water Bureau
Serves 666,200 people · Surface water · Full report →
No health-based violations in the last 5 years; 1 monitoring/reporting violation; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2025).
A
Lake Oswego Municipal Water
Serves 40,000 people · Surface water · Full report →
No health-based violations in the last 5 years; 2 monitoring/reporting violations; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2023).
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City of West Linn
Serves 28,000 people · Surface water · Full report →
No health-based violations in the last 5 years; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2024).
B
Rivergrove Water District
Serves 4,000 people · Groundwater · Full report →
No health-based violations in the last 5 years; 26 monitoring/reporting violations; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2025).
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Lake Grove Water District
Serves 3,100 people · Surface water · Full report →
No health-based violations in the last 5 years; 3 monitoring/reporting violations; No UCMR 5 PFAS results on file; Lead 90th percentile below the action level (2025).
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Palatine Hill Water District
Serves 1,500 people · Surface water · Full report →
No health-based violations in the last 5 years; 2 monitoring/reporting violations; No UCMR 5 PFAS results on file; Lead 90th percentile below the action level (2025).
C
Southwood Park Water District
Serves 900 people · Groundwater · Full report →
1 health-based violation in the last 5 years; 7 monitoring/reporting violations; No UCMR 5 PFAS results on file; Lead 90th percentile below the action level (2024).
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Glenmorrie Cooperative Assn
Serves 310 people · Groundwater · Full report →
No health-based violations in the last 5 years; 4 monitoring/reporting violations; No UCMR 5 PFAS results on file; Lead 90th percentile below the action level (2025).
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Skylands Water Company
Serves 250 people · Groundwater · Full report →
No health-based violations in the last 5 years; 2 monitoring/reporting violations; No UCMR 5 PFAS results on file; Lead 90th percentile below the action level (2025).
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Hiland WC - Shadow Wood
Serves 175 people · Groundwater · Full report →
No health-based violations in the last 5 years; 3 monitoring/reporting violations; No UCMR 5 PFAS results on file; Lead 90th percentile below the action level (2023).
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Country Club Water District
Serves 150 people · Groundwater · Full report →
No health-based violations in the last 5 years; 2 monitoring/reporting violations; No UCMR 5 PFAS results on file; Lead 90th percentile below the action level (2025).
B
Mossy Brae Water District
Serves 100 people · Groundwater · Full report →
No health-based violations in the last 5 years; 6 monitoring/reporting violations; No UCMR 5 PFAS results on file; Lead 90th percentile below the action level (2025).
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Ashdown Wood Water Company
Serves 75 people · Groundwater · Full report →
No health-based violations in the last 5 years; 4 monitoring/reporting violations; No UCMR 5 PFAS results on file; Lead 90th percentile below the action level (2023).