Public Water Partners

LONGMONT, CO · Boulder County

LONGMONT CITY OF Water System

Consumer Confidence Report status

LONGMONT CITY OF must publish a Consumer Confidence Report — the annual drinking water quality report covering calendar year 2026 — by July 1, 2027.

As of August 1, 2026, EPA's federal records show no open violations for LONGMONT CITY OF.

Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed August 1, 2026. This is a record-keeping and public-information tool — it does not replace Colorado’s official records. Always confirm current status with Colorado before making decisions based on this information.

System facts

System ID (PWSID)
CO0107485
System type
Community Water System
Population served
104,178
Service connections
30,296
Ownership
local government
Water source
surface water (rivers, lakes, or reservoirs)

LONGMONT CITY OF is among the 14 largest community water systems in Colorado, serving 104,178 people from surface water.

As of August 1, 2026, its federal record holds 21 entries between 1995 and 2022, all of which EPA lists as closed. Nothing has been added since 2022.

Of the 21, 20 are monitoring and reporting requirements — the category that accounts for about four in five of all violations in EPA's national dataset — rather than findings about the water itself. The record involves synthetic organic chemicals, the Stage 2 Disinfectants and Disinfection Byproducts Rule, and the Surface Water Treatment Rules.

Violation history

  • Monitoring and Reporting (DBP)

    —

    TTHM

    July 1, 2022 – September 30, 2022

    Resolved

  • Monitoring, Regular

    —

    BHC-GAMMA

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Toxaphene

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Dalapon

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Diquat

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Endothall

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    OXAMYL

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Simazine

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Picloram

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Hexachlorocyclopentadiene

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Carbofuran

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Aldicarb

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Atrazine

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    LASSO

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Heptachlor

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    2,4,5-TP

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    HEXACHLOROBENZENE

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Benzo(a)pyrene

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Chlordane

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Aldicarb sulfoxide

    January 1, 2005 – December 31, 2007

    Resolved

  • Treatment Technique (SWTR and GWR)

    Health-based

    Surface Water Treatment Rule

    June 1, 1995 – June 30, 1995

    Resolved

Resolved addressed and confirmed by the state

Enforcement actions

Common questions

Is LONGMONT CITY OF required to publish a Consumer Confidence Report?

Yes. LONGMONT CITY OF is a community water system, and federal rules (40 CFR 141 Subpart O) require every community water system to publish a Consumer Confidence Report each year.

When is LONGMONT CITY OF’s next Consumer Confidence Report due?

LONGMONT CITY OF’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.

Does LONGMONT CITY OF have any open drinking water violations on record?

As of August 1, 2026, EPA's federal records show no open violations for LONGMONT CITY OF.

What is a Consumer Confidence Report?

A Consumer Confidence Report (CCR) is the annual drinking water quality report that community water systems must provide to the people they serve. It lists the contaminants detected in the system’s water during the year, where the water comes from, and how the results compare with federal limits. EPA’s revised CCR rule takes effect January 1, 2027, and the first reports in the new format are due July 1, 2027.

Contact

HUFFER, CHRIS

303-651-8351

LONGMONT, CO 80501