Golden State Water Company – Southwest System
Southwest California service territory, including the GSWC Southwest system
Population reference
277,740 people (EPA SDWIS PWS ID CA1910155; 2026 active CWS record).
Billing detail
Partial public detail found
Official destination
Open provider website ↗Provider-specific findings
Billing and account research from public material
Provider-specific research notes are displayed separately from fields that contain only an unavailable-information marker. Read qualifiers in each note and verify current account terms with the provider.
- Billing frequency
- Monthly or bimonthly depending on service district and customer class; GSWC rates are regulated by California division and tariff.
- Rate structure
- CPU C-regulated investor-owned utility tariffs with district-specific fixed service charges, metered consumption, purchased-water adjustments, and 2026 adopted revenue increases. The January 2026 GSWC rate update applies the second-year rate increases approved by the California Public Utilities Commission.
- Wastewater and sewer calculation
- GSWC’s reviewed Southwest water materials do not establish one universal sewer calculation; some services are water-only and wastewater may be billed by a separate local provider or tariff.
- Meter reading
- GSWC bills from district metered consumption and publishes CPUC-regulated tariffs; the reviewed Southwest pages do not identify an AMI vendor, hourly interval, or universal reading calendar.
Context, not a score
How documentation coverage compares
This profile
57%
overview fields with research notes
California
67%
records with any overview detail
National index
50%
records with any overview detail
Coverage measures what this directory documented. It does not measure service quality, affordability, or regulatory compliance.
Research record
Partial public detail found
4 of 7 fields in this section contain provider-specific public detail in dataset August 1, 2026.
Documented
57%
Details not confirmed in the reviewed public material
- Residential cost reference
- New-account deposit
- Activation or transfer fee
“Not confirmed” means the directory did not identify a dependable public statement. It does not mean the provider has no policy or option.
Primary verification routes
- Golden State Water Company – Southwest System public website ↗
Provider-controlled destination used to confirm current customer instructions.
- EPA SDWIS / ECHO lookup (CA1910155) ↗
Search the federal drinking-water database using public water system ID CA1910155.