Private Investor-Owned Utility
California Water Service Company - Oroville System
Serving Oroville and vicinity in Butte County
Population served
11,106 people; 2,731 residential service connections, 780 commercial connections, and 17 industrial connections according to California Drinking Water Watch for active system CA0410005.
State system code
FIPS 06
Billing frequency
Generally monthly billing, with the bill showing the service period, meter read dates, current charges, due date, and prior balance. The exact read and due-date calendar is premise-specific.
Provider briefing
How this utility’s billing works
California Water Service Company - Oroville System operates as a private investor-owned utility serving Oroville and vicinity in Butte County. Customers should use the provider’s current account-specific bill and official customer-service instructions as the final authority for deadlines, balances, and service requests.
The published water-rate framework is described as CPUC-regulated metered residential structure for the Oroville tariff area, with a fixed monthly service charge plus volumetric charges under the Residential Metered Service ORO (North Valley Region) schedule; separate non-residential, limited-flat-rate, irrigation, and interruptible-irrigation schedules also apply. Cal Water's current Oroville page identifies the residential ORO tariff as effective July 1, 2026, but the live page did not expose the current dollar table, so unpublished tier amounts are not inferred.. Bills are generated generally monthly billing, with the bill showing the service period, meter read dates, current charges, due date, and prior balance. the exact read and due-date calendar is premise-specific., and a typical residential cost reference is A dedicated this detail was not publicly posted. For an exact 2026 dollar estimate because Cal Water's current Oroville page confirms the July 1, 2026 residential-metered tariff but its live rate link did not expose the current dollar values. Actual cost varies by meter size, CCF usage, billing days, adopted surcharges, and service classification. Sewer, taxes, and any separate local charges are excluded.. These descriptions are useful planning benchmarks; actual charges can change with meter size, usage, sewer averaging, local taxes, drought stages, or account-specific fees.
Wastewater and sewer calculation
Cal Water bills the Oroville potable-water charge. Sewer or wastewater charges are normally imposed separately by the City of Oroville or another serving sewer agency and are not governed by one Cal Water formula. The sewer agency may use actual water consumption, a winter average, a residential cap, or a fixed equivalent-unit charge. Customers should compare the water meter usage with the separate sewer bill and ask the serving agency for its current base, usage, winter-average, and adjustment rules.
Meter and infrastructure notes
The Oroville system uses customer water meters and Cal Water's periodic billing reads. The district page does not publish a fixed local AMI deployment percentage or route day; Cal Water company materials describe AMR/AMI pilots in selected districts but do not establish that every Oroville account has an advanced meter. Customers should use the bill's read dates and current/previous reads, review usage history in the portal, and ask Cal Water to confirm the exact meter technology and leak-alert capability for the premise. Cal Water reports a surface-water supply from the west branch of the Feather River processed at its treatment plant, supplemented by four local wells, with 52 miles of pipeline, two storage tanks, and six booster pumps.
Emergency water support
Report a leak or water emergency
For water emergencies, main breaks, service-line leaks, flooding, or suspected water-quality problems in the Oroville District, call 530-533-4034; Cal Water lists the same number for main and after-hours contact. Call 911 for an immediate life-safety emergency and avoid contact with contaminated or electrically hazardous water.
Official starting point
Choose the right next step
Reading this profile
A practical reference for Oroville and vicinity in Butte County
California Water Service Company - Oroville System is listed here as a private investor-owned utility. The profile separates account actions—such as paying a bill or requesting service—from explanatory material about rates, meters, wastewater, leaks, and delinquency.
Because utility rules can vary by account class, meter size, service address, billing date, and local ordinance, treat the published bill and current provider website as the final authority. Use this profile to locate the correct channel and prepare better questions for customer service.
If your issue is urgent, start with the provider’s emergency number or official payment route rather than waiting for an email response. Keep a written record of calls, confirmation numbers, notice dates, and documents you submit.