City of Thornton – Thornton Water and Utility Billing

Provider briefing

How this utility’s billing works

City of Thornton – Thornton Water and Utility Billing operates as a municipal department serving Thornton and the city’s extended treated-water service area, including portions of unincorporated Adams County and bulk treated-water deliveries to Westminster. 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 Water-budget pricing for single-family detached homes inside the city, with an Average Winter Consumption (AWC) indoor allocation, a lot-size-based Monthly Outdoor Allowance (MOA), a high-use tier, and an excessive-use tier. Effective January 1, 2026, inside-city water is $7.76 per 1,000 gallons through Tier 1 AWC and Tier 2 AWC plus MOA, $11.64 per 1,000 gallons for Tier 3 consumption through the 20,000-gallon high-use allotment, and $23.29 per 1,000 gallons for remaining Tier 4 consumption. The 5/8-by-3/4-inch single-family water service charge is $10.97 per month. Outside-city rates are higher: $11.64, $17.46, and $34.46 per 1,000 gallons for the corresponding published tiers.. Bills are generated monthly. thornton states that water, sewer, stormwater, and trash charges may appear together on the monthly utility bill. the sewer ordinance defines average winter consumption (awc) from the november–february billing periods and recalculates it annually., and a typical residential cost reference is Thornton’s official 2026 fact sheet gives the most defensible typical estimates: an inside-city single-family home on a 7,000-square-foot lot using about 4,260 gallons in winter has a typical water bill of $44.03, while a 12,340-gallon summer-use bill is $106.73. For a simplified 5,000-gallon example, $10.97 water service plus 5 × $7.76 water usage equals about $49.77 before sewer, stormwater, trash, and any tier allocation above AWC/MOA; at 7,000 gallons the same simple calculation is about $65.29. Actual bills depend on each home’s AWC, lot-size MOA, sewer AWC, stormwater, trash service, and drought-related rules.. 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

Thornton sewer quantity charges are based on the home’s Average Winter Consumption. For 2026, the AWC is the average of monthly meter readings for the November–February winter period, normalized by dividing winter consumption by winter-period days and multiplying by 30.42; the process repeats each year. Inside-city domestic sewer charges for a 5/8-by-3/4-inch connection are $8.99 per month plus $4.04 per 1,000 gallons of AWC. Outside-city charges are $13.49 per month plus $6.06 per 1,000 gallons. If an AWC cannot be established or is not representative, Thornton uses the class average for the same meter size until a new AWC can be calculated.

Meter and infrastructure notes

Thornton is implementing Advanced Metering Infrastructure and replaces residential meters as they age, generally after a 15–20-year useful life. AMI combines water meters, communications networks, and data-management systems to improve reading efficiency and provide more detailed usage data. The Thornton WaterSmart portal lets customers track monthly usage and set leak alerts; the city’s 2026 tier guide ties indoor allocation to November–February AWC and outdoor allocation to lot-size MOA. The current public page does not promise a single transmission interval for every meter, so customers should use the portal’s displayed data and alerts as the operational record.