Is San Luis Obispo, California tap water safe?
14 water systems report serving San Luis Obispo. 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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San Luis Obispo Water Department
Serves 49,534 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 (2025).
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California Mens Colony
Serves 15,000 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).
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Golden State Water Company - Edna
Serves 1,495 people · Groundwater · Full report →
No health-based violations in the last 5 years; No UCMR 5 PFAS results on file; Lead 90th percentile below the action level (2023).
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Slo Cwwd No. 23 - Santa Margarita
Serves 1,291 people · Groundwater · Full report →
No health-based violations in the last 5 years; No UCMR 5 PFAS results on file; Lead 90th percentile below the action level (2023).
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Irish Hills Mutual Water Co
Serves 135 people · Groundwater · Full report →
No health-based violations in the last 5 years; No UCMR 5 PFAS results on file; Lead 90th percentile below the action level (2025).
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Edna Valley Ranch East
Serves 132 people · Groundwater · Full report →
No health-based violations in the last 5 years; No UCMR 5 PFAS results on file; Lead 90th percentile below the action level (2025).
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Afuera De Chorro Water Company
Serves 85 people · Groundwater · Full report →
No health-based violations in the last 5 years; 1 monitoring/reporting violation; No UCMR 5 PFAS results on file; Lead 90th percentile below the action level (2023).
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Bassi Ranch Mutual Water Co.
Serves 85 people · Groundwater · Full report →
No health-based violations in the last 5 years; 3 monitoring/reporting violations; 1 not yet resolved; No UCMR 5 PFAS results on file; Lead 90th percentile below the action level (2022).
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H2o, Inc
Serves 70 people · Groundwater · Full report →
No health-based violations in the last 5 years; 1 monitoring/reporting violation; No UCMR 5 PFAS results on file; Lead 90th percentile below the action level (2023).
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Lopez Project
Serves 69 people · Surface water · Full report →
1 health-based violation in the last 5 years; No UCMR 5 PFAS results on file; Lead 90th percentile below the action level (2025).
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Bear Valley Water Company
Serves 45 people · Groundwater · Full report →
No health-based violations in the last 5 years; 3 monitoring/reporting violations; 1 not yet resolved; No UCMR 5 PFAS results on file; Lead 90th percentile below the action level (2022).
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Higuera Apartments
Serves 30 people · Groundwater · Full report →
20 health-based violations in the last 5 years; 3 monitoring/reporting violations; 3 not yet resolved; No UCMR 5 PFAS results on file; Lead 90th percentile above the new 10 ppb action level (LCRI, effective Nov 1, 2027); Lead 90th percentile below the action level (2021).
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Chorro Valley Pipeline - Slo County
Population not reported (often a wholesaler) · Surface water · Full report →
No health-based violations in the last 5 years; No UCMR 5 PFAS results on file.
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Nacimiento Water Project
Population not reported (often a wholesaler) · Surface water · Full report →
No health-based violations in the last 5 years; No UCMR 5 PFAS results on file.