MODESTO, CA · Stanislaus County
MODESTO, CITY OF Water System
Consumer Confidence Report status
MODESTO, CITY OF must publish a Consumer Confidence Report — the annual drinking water quality report covering calendar year 2026 — by July 1, 2027.
As of August 1, 2026, EPA's federal records show no open violations for MODESTO, CITY OF.
Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed August 1, 2026. This is a record-keeping and public-information tool — it does not replace California’s official records. Always confirm current status with California before making decisions based on this information.
System facts
- System ID (PWSID)
- CA5010010
- System type
- Community Water System
- Population served
- 218,771
- Service connections
- 70,793
- Ownership
- local government
- Water source
- surface water (rivers, lakes, or reservoirs)
MODESTO, CITY OF is among the 25 largest community water systems in California, serving 218,771 people from surface water.
As of August 1, 2026, its federal record holds 1 entry in 2007, all of which EPA lists as closed. Nothing has been added since 2007.
None of the 1 are monitoring or reporting requirements — the category that accounts for about four in five of all violations in EPA's national dataset; these involve water-quality, treatment, or public-notice findings instead. The record involves inorganic chemicals.
Violation history
Maximum Contaminant Level Violation, Average
Health-basedNitrate
March 1, 2007 – March 31, 2007
Resolved
Resolved addressed and confirmed by the state
| Period | Violation | Contaminant / rule | Health-based | Status |
|---|---|---|---|---|
| March 1, 2007 – March 31, 2007 | Maximum Contaminant Level Violation, Average | Nitrate | Health-based | Resolved |
Resolved addressed and confirmed by the state
Enforcement actions
- September 9, 2013State Administrative/Compliance Order without penalty issued12 linked violations
- July 19, 2010State Administrative/Compliance Order without penalty issuedgeneral compliance action — not tied to a specific violation on record
- April 12, 2007State Compliance achieved3 linked violations
- March 23, 2007State Administrative/Compliance Order without penalty issued2 linked violations
- August 1, 1995State Compliance achieved9 linked violations
Common questions
Is MODESTO, CITY OF required to publish a Consumer Confidence Report?
- Yes. MODESTO, CITY OF is a community water system, and federal rules (40 CFR 141 Subpart O) require every community water system to publish a Consumer Confidence Report each year.
When is MODESTO, CITY OF’s next Consumer Confidence Report due?
- MODESTO, CITY OF’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.
Does MODESTO, CITY OF have any open drinking water violations on record?
- As of August 1, 2026, EPA's federal records show no open violations for MODESTO, CITY OF.
What is a Consumer Confidence Report?
- A Consumer Confidence Report (CCR) is the annual drinking water quality report that community water systems must provide to the people they serve. It lists the contaminants detected in the system’s water during the year, where the water comes from, and how the results compare with federal limits. EPA’s revised CCR rule takes effect January 1, 2027, and the first reports in the new format are due July 1, 2027.
Contact
MARTINEZ, MANUEL
209-342-4592
MODESTO, CA 95355