City of Thornton – Thornton Water and Utility Billing
Thornton and the city’s extended treated-water service area, including portions of unincorporated Adams County and bulk treated-water deliveries to Westminster
Population reference
Approximately 225,000 people served by Thornton’s drinking-water system according to the city’s 2025 water-quality report; the 2025 water-efficiency plan separately describes about 165,453 people in the existing treated-water service area and 43,048 metered connections in its 2022 baseline.
Billing detail
Broad 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. 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.
- Rate structure
- 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.
- Residential cost reference
- 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.
- 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 reading
- 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.
- New-account deposit
- The 2026 water ordinance does not publish a universal residential security deposit or credit-check waiver. It does impose a $2,500 refundable deposit for a temporary hydrant meter, which is a construction/bulk-water requirement rather than a normal residential account deposit; usage, rental, and other charges may be deducted and the remaining balance refunded. New or commercial accounts should confirm any account-specific deposit requirement with Utility Billing at 303-538-7370.
- Activation or transfer fee
- The 2026 water ordinance establishes a $20.00 new-account charge when a customer requests water service or changes the name on a water account, except name changes due to marriage, dissolution of marriage, inheritance, or an owner’s forwarding-address change. Title-company move-in/move-out requests must be for a business day, at least one day in advance, within the city’s seven-day scheduling window, and are not processed same day. New physical water connections are subject to separate development and connection fees.
Context, not a score
How documentation coverage compares
This profile
100%
overview fields with research notes
Colorado
68%
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
Broad public detail found
7 of 7 fields in this section contain provider-specific public detail in dataset August 1, 2026.
Documented
100%
Primary verification routes
- City of Thornton – Thornton Water and Utility Billing public website ↗
Provider-controlled destination used to confirm current customer instructions.
- EPA Safe Drinking Water Information System ↗
Federal background on public water-system records and their limitations.