CWSC LOS ALTOS SUBURBAN
San Jose, CA · 69,973 served
CWSC LOS ALTOS SUBURBAN serves 69,973 people in San Jose, CA. It has 0 health-based violations in the last 5 years. TapGraded gives this system an A.
Score breakdown
Health-based violations (5y)
0
Monitoring violations (5y)
0
Currently unaddressed
0
Overall score
92/100
Violation history (last 5 years)
No violations on record.
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Lead (Lead and Copper Rule)
EPA's current lead action level is 15 ppb (dropping to 10 ppb in 2027 under the Lead and Copper Rule Improvements).
PFAS (UCMR5 occurrence data)
System details
- System type
- Community water system
- Water source
- Surface water purchased from another system
- Ownership
- Private
- Service connections
- 18,530
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Is San Jose, CA tap water safe to drink?
CWSC LOS ALTOS SUBURBAN has 0 health-based violations in the last 5 years. TapGraded gives this system an A.
Does CWSC LOS ALTOS SUBURBAN have lead in its water?
The most recent 90th-percentile lead sample is 1.5 ppb, versus the EPA action level of 15 ppb.
Has PFAS been detected in CWSC LOS ALTOS SUBURBAN's water?
Yes — PFAS was detected, but below the EPA MCL for every tracked analyte.
Source: EPA SDWIS/ECHO · Data as of 2026Q2