Public water system record
CWSC Los Altos Suburban
Serves Los Altos, Sunnyvale, Mountain View and 3 more places, Santa Clara County, CA · 69,973 people served
Federal records show no health-based violations and no monitoring or reporting issues for CWSC Los Altos Suburban in the last ten years.
System profile
- Health-based violations, last 10 years
- 0
- Resolved
- 0
- Unresolved
- 0
- Any acute record
- No
- Monitoring issues, last 10 years
- 0
Key facts
- CWSC Los Altos Suburban draws water from 20 wells.
- Record on file since 1992, with 1 health-based violation before October 19, 2016.
- Lead pipe inventory: 0 lead and 15,503 unknown out of 18,770 service lines.
Check whether CWSC Los Altos Suburban serves your address
Health-based violations
Since October 2016Violation data reflects EPA records through March 2026. For the most current status, visit the EPA ECHO database.
None since October 2016, and no monitoring or reporting violations either.
Full record since 1992
EPA's records for CWSC Los Altos Suburban go back to 1992. Before October 19, 2016 they list 1 health-based violation (1 resolved) and 2 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1990s | 1 | 1 |
| 2000s | 0 | 1 |
Most recent health-based violation before October 19, 2016: Total Coliform (acute), began November 1992, Resolved.
Show the health-based violation before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Total Coliform (acute)
Contaminant limit exceeded
|
Nov 1, 1992 | Resolved |
Where the water comes from
CWSC Los Altos Suburban draws water from 20 wells. It also buys water from Santa Clara Valley Water District. It also has an emergency connection to Purissima Hills Water District. 2 other public water systems have emergency connections to CWSC Los Altos Suburban.
Buys water from
- Santa Clara Valley Water District San Jose, CA
Emergency or part-time connections to
- Purissima Hills Water District Los Altos Hills, CA
Annual water quality report
CWSC Los Altos Suburban must give its customers an annual water quality report (Consumer Confidence Report) by July 1, with the levels its tests found in the previous year.
Systems serving 10,000 or more people must mail or deliver the report to every customer, and from 2027 they must send it twice a year.
Find a posted report with EPA's Consumer Confidence Report search
Testing your own water
To test the water at your tap, or a private well this record does not cover, use a laboratory certified for drinking water by California.
Certified drinking water labs by state EPA guidance for private wells