Public water system record
City of Cupertino
Serves Cupertino, Santa Clara County, CA · 16,336 people served
Federal records show no health-based violations and no monitoring or reporting issues for City of Cupertino 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
- City of Cupertino draws water from 2 wells.
- Record on file since 1992, with 3 health-based violations before October 19, 2016.
- Lead pipe inventory: 0 lead and 0 unknown out of 4,394 service lines.
Check whether City of Cupertino 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 City of Cupertino go back to 1992. Before October 19, 2016 they list 3 health-based violations (3 resolved) and no monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1990s | 3 | 0 |
Most recent health-based violation before October 19, 2016: Total Trihalomethanes (TTHMs), began February 1993, Resolved.
Show all 3 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
|
Feb 22, 1993 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
|
Nov 24, 1992 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
|
Sep 1, 1992 | Resolved |
Where the water comes from
City of Cupertino draws water from 2 wells. It also buys water from Santa Clara Valley Water District. It also has emergency connections to San Jose Water and City of Sunnyvale. 2 other public water systems have emergency connections to City of Cupertino.
Buys water from
- Santa Clara Valley Water District San Jose, CA
Emergency or part-time connections to
- San Jose Water San Jose, CA
- City of Sunnyvale Sunnyvale, CA
Annual water quality report
City of Cupertino 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