Public water system record
City of Longmont
Serves Longmont, Boulder County, CO · 102,866 people served
Federal records show no health-based violations and 2 monitoring/reporting issues for City of Longmont 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
- 2
Key facts
- City of Longmont draws water from 6 surface water intakes (3 of them for emergency, seasonal or other part-time use).
- Record on file since 1988, with 1 health-based violation before October 19, 2016.
- Lead pipe inventory: 0 lead and 0 unknown out of 30,821 service lines.
Check whether City of Longmont 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 |
|---|---|---|
|
Haloacetic Acids (HAA5)
Monitoring and reporting
|
Jul 1, 2022 | Resolved |
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Jul 1, 2022 | Resolved |
Full record since 1988
EPA's records for City of Longmont go back to 1988. Before October 19, 2016 they list 1 health-based violation (1 resolved) and 38 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1980s | 0 | 7 |
| 1990s | 1 | 0 |
| 2000s | 0 | 31 |
| 2020s | 0 | 2 |
Most recent health-based violation before October 19, 2016: Surface Water Treatment Rule, began June 1995, Resolved.
Show the health-based violation before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Surface Water Treatment Rule
Treatment technique failure
|
Jun 1, 1995 | Resolved |
Where the water comes from
City of Longmont draws water from 6 surface water intakes (3 of them for emergency, seasonal or other part-time use). It also has an emergency connection to Left Hand WD. 6 other community water systems buy water from City of Longmont. 2 other public water systems have emergency connections to City of Longmont.
Emergency or part-time connections to
- Left Hand WD Niwot, CO
Community systems that buy water from it
- Countryside of Longmont Lakewood, CO
- Grand Meadow of Longmont MHP Lakewood, CO
- LMP Coop MHP Greeley, CO
- Mountain View MHP Loveland, CO
- St Vrain MHP LLC Lakewood, CO
- Town of Lyons Lyons, CO
Annual water quality report
City of Longmont 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