Public water system record
City of Thornton
Serves Thornton, Adams County, CO · 226,465 people served
Federal records show no health-based violations and 8 monitoring/reporting issues for City of Thornton in the last ten years.
System profile
- Health-based violations, last 10 years
- 0
- Resolved
- 0
- Unresolved
- 0
- Any acute record
- No
- Monitoring issues, last 10 years
- 8
Key facts
- City of Thornton draws water from 3 surface water intakes.
- Record on file since 2003, with 0 health-based violations before October 19, 2016.
- Lead pipe inventory: 0 lead and 0 unknown out of 43,826 service lines.
Check whether City of Thornton serves your address
Health-based violations
Since October 2016Violation data reflects EPA records through March 2026. For the most current status, visit the EPA ECHO database.
None since October 2016.
Monitoring and reporting issues
Since October 2016Missed tests or reports, not contaminants found above a limit.
| Issue | Start date | Status |
|---|---|---|
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
Nov 1, 2023 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
Oct 1, 2023 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
Sep 1, 2023 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Jul 1, 2023 | Resolved |
|
Gross Alpha, Excl. Radon and U
Monitoring and reporting
|
Apr 1, 2022 | Resolved |
|
Combined Uranium
Monitoring and reporting
|
Apr 1, 2022 | Resolved |
|
Combined Radium (-226 and -228)
Monitoring and reporting
|
Apr 1, 2022 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
May 1, 2021 | Resolved |
Full record since 2003
EPA's records for City of Thornton go back to 2003. Before October 19, 2016 they list no health-based violations and 3 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 2000s | 0 | 2 |
| 2010 to October 18, 2016 | 0 | 1 |
| 2020s | 0 | 8 |
Where the water comes from
City of Thornton draws water from 3 surface water intakes. 8 other community water systems buy water from City of Thornton. 1 other public water system has an emergency connection to City of Thornton.
Community systems that buy water from it
- Avilla Eastlake Greenwood Village, CO
- City of Brighton Brighton, CO
- Friendly Village of the Rockies Thornton, CO
- Pine Lakes Ranch Lakewood, CO
- Redwood Estates Lakewood, CO
- The Grove at Alta Ridge Thornton, CO
- Thornton Estates Lakewood, CO
- Woodland Hills MHC Thornton, CO
Annual water quality report
City of Thornton must give its customers an annual water quality report (Consumer Confidence Report) by July 1, with the levels its tests found in the previous year.
Systems serving 10,000 or more people must mail or deliver the report to every customer, and from 2027 they must send it twice a year.
Find a posted report with EPA's Consumer Confidence Report search
Testing your own water
To test the water at your tap, or a private well this record does not cover, use a laboratory certified for drinking water by Colorado.
Certified drinking water labs by state EPA guidance for private wells