Public Water Authority
Moulton Niguel Water District
Serving Laguna Niguel, Aliso Viejo, Laguna Hills, Mission Viejo, Dana Point, and San Juan Capistrano service areas
Population served
170,236 residents served by active CWS CA3010073, with 49,471 residential meter connections listed by California Drinking Water Watch; the District’s current operations page describes a service area of approximately 37 square miles across six South Orange County communities.
State system code
FIPS 06
Billing frequency
Monthly or another interval stated on the account bill; current district payment and rate materials describe monthly bills, monthly service charges, and monthly water budgets.
Provider briefing
How this utility’s billing works
Moulton Niguel Water District operates as a public water authority serving Laguna Niguel, Aliso Viejo, Laguna Hills, Mission Viejo, Dana Point, and San Juan Capistrano service areas. 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 Personalized increasing-block water-budget rates. Each residential account receives a monthly indoor budget based on 55 gallons per person per day and an outdoor budget based on irrigable area, localized daily evapotranspiration, and a landscaping factor. Indoor budget usage is Tier 1, outdoor budget usage is Tier 2, and usage above the total budget is charged through higher Tiers 3, 4, and 5. A fixed monthly service charge is based on meter size, and the District may pass through certain wholesale-water cost increases subject to its adopted rules.. Bills are generated monthly or another interval stated on the account bill; current district payment and rate materials describe monthly bills, monthly service charges, and monthly water budgets., and a typical residential cost reference is Approximately $82-$90 per month for a simplified 2026 single-family illustration with a 5/8-inch meter, four occupants, no separately quantified outdoor allocation, and 5,000-7,000 gallons monthly. The calculation uses the $11.13 monthly water service charge, 2026 Tier 1 water rate of $2.76 per billing unit, Tier 2 rate of $3.70 when the 7,000-gallon example exceeds the four-person indoor budget, and wastewater of $28.88 monthly plus $5.89 per person. Actual bills vary materially with the parcel’s irrigable area, local ET, household count, meter size, recycled-water service, and assigned budget.. 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
For 2026 single-family residential service, wastewater has a flat $28.88 monthly service charge plus $5.89 per person per month. The District states that the household count drives the residential wastewater volumetric component, rather than a winter-average percentage of potable-water intake. MNWD operates two wastewater treatment plants for approximately 85% of District wastewater and contracts treatment/disposal of the balance through neighboring agencies, with South Orange County Wastewater Authority costs passed through under the adopted rate framework.
Meter and infrastructure notes
MNWD completed a systemwide smart-meter upgrade and its MyWater portal displays monthly, daily, and hourly consumption data plus leak alerts. The District’s water-budget calculations use meter-read dates, daily localized ET data from 110 microclimate zones, and monthly billing cycles. The public materials do not identify the AMI hardware vendor or a universal calendar date for each route, but the hourly portal data confirms advanced metering and interval usage visibility rather than solely manual monthly reads.
Emergency water support
Report a leak or water emergency
(949) 831-2500 is MNWD’s published 24/7 water-or-sewer emergency number for water main breaks, leaks, sewer incidents, and other urgent service problems. Billing questions use (949) 448-4050, and water-efficiency assistance uses (949) 448-4025.
Official starting point
Choose the right next step
Reading this profile
A practical reference for Laguna Niguel, Aliso Viejo, Laguna Hills, Mission Viejo, Dana Point, and San Juan Capistrano service areas
Moulton Niguel Water District is listed here as a public water authority. 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.