HAWTHORNE, CA · Los Angeles County
GSWC - SOUTHWEST Water System
Consumer Confidence Report status
GSWC - SOUTHWEST 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 GSWC - SOUTHWEST.
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)
- CA1910155
- System type
- Community Water System
- Population served
- 277,740
- Service connections
- 52,644
- Ownership
- privately owned
- Water source
- surface water (rivers, lakes, or reservoirs)
GSWC - SOUTHWEST is among the 18 largest community water systems in California, serving 277,740 people from surface water.
As of August 1, 2026, its federal record holds 2 entries between 2007 and 2014, all of which EPA lists as closed. Nothing has been added since 2014.
All 2 are monitoring and reporting requirements — the category that accounts for about four in five of all violations in EPA's national dataset — rather than findings about the water itself. The record involves the Groundwater Rule and the Total Coliform Rules.
Violation history
Monitoring, Source Water (GWR)
—E. COLI
November 21, 2014 – December 1, 2014
ResolvedMonitoring, Routine Minor (TCR)
—Coliform (TCR)
June 1, 2007 – June 30, 2007
Resolved
Resolved addressed and confirmed by the state
| Period | Violation | Contaminant / rule | Health-based | Status |
|---|---|---|---|---|
| November 21, 2014 – December 1, 2014 | Monitoring, Source Water (GWR) | E. COLI | — | Resolved |
| June 1, 2007 – June 30, 2007 | Monitoring, Routine Minor (TCR) | Coliform (TCR) | — | Resolved |
Resolved addressed and confirmed by the state
Enforcement actions
- December 1, 2014State Formal Notice of Violation issued1 linked violation
- December 1, 2014State Compliance achieved1 linked violation
- December 30, 2011State Administrative/Compliance Order without penalty issued1 linked violation
- December 30, 2011State Compliance achieved1 linked violation
- October 5, 2007State Violation/Reminder Notice1 linked violation
Common questions
Is GSWC - SOUTHWEST required to publish a Consumer Confidence Report?
- Yes. GSWC - SOUTHWEST 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 GSWC - SOUTHWEST’s next Consumer Confidence Report due?
- GSWC - SOUTHWEST’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.
Does GSWC - SOUTHWEST have any open drinking water violations on record?
- As of August 1, 2026, EPA's federal records show no open violations for GSWC - SOUTHWEST.
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
SCHULTISE, DAVE
310-263-4141
HAWTHORNE, CA 90250