Drinking Water Systems in SAN LUIS OBISPO, California
20 water systems are reported for this city, with a combined service population of 69,727. The systems have 5 EPA violation records in the five-year period ending June 30, 2026.
Water Systems Serving SAN LUIS OBISPO
BARON CANYON MUTUAL WATER CO.
81 served0 historical records
A
CALLENDER GROVE MUTUAL WATER
126 served0 historical records
A
LAS VENTANAS RANCH
108 served0 historical records
A
IRISH HILLS MUTUAL WATER CO
135 served3 historical records
A
SLOCSA #10A - CAYUCOS
1,200 served0 historical records
A
NACIMIENTO WATER PROJECT
0 served0 historical records
A
SLO CSA NO. 16 - SHANDON
1,085 served0 historical records
A
SLO CWWD NO. 23 - SANTA MARGARITA
1,291 served0 historical records
A
SLO CSA NO. 10 - CAYUCOS WTP
0 served1 historical record
A
LOPEZ PROJECT
1,569 served2 historical records1 recent
C
CHORRO VALLEY PIPELINE - SLO COUNTY
0 served0 historical records
A
AVILA VALLEY MUTUAL WATER CO
75 served26 historical records
A
LAUREATE WATER COMPANY
700 served0 historical records
A
AFUERA DE CHORRO WATER COMPANY
85 served0 historical records
A
CALIFORNIA MENS COLONY
15,000 served3 historical records1 recent
B
MONTE SERENO MUTUAL BENEFIT WATER
65 served0 historical records
A
SAN LUIS OBISPO WATER DEPARTMENT
47,788 served0 historical records
A
BEAR VALLEY WATER COMPANY
45 served3 historical records
A
HIGUERA APARTMENTS
30 served3 historical records3 recent
D
SANTA YSABEL RANCH MWC
344 served0 historical records
A
EPA Contaminant Categories in Historical Violation Records
Gross Alpha4 records
Nitrate3 records
Consumer Confidence Rule2 records
Coliform (TCR)2 records
Total Trihalomethanes (TTHMs)1 record
Revised Total Coliform Rule1 record
Stage 1 Disinfectants and Disinfection Byproducts Rule1 record
Surface Water Treatment Rule1 record
Category counts aggregate historical compliance records across listed systems. They do not show current concentrations or household test results.