Boulder Water Quality
Colorado
According to EPA SDWIS, Boulder, Colorado is served by 13 community water systems covering about 170,534 people. The same extract lists 28 health-based violation records, most recently coded 5200 in 2026. Counts are historical EPA registry rows, not a current compliance or drinkability score.
Drinking water in Boulder, Colorado is delivered through 13 EPA-regulated community water systems serving an estimated 170,534 people. Each system is tracked in the EPA Safe Drinking Water Information System (SDWIS) under the Safe Drinking Water Act, which requires testing for regulated contaminants, consumer notification of violations, and publication of an annual Consumer Confidence Report.
PlainEnviro's health-based SDWIS extract shows 28 violation records across the 13 active community systems shown here. Monitoring and reporting records are not present in the extract. The records carry 7 distinct EPA contaminant codes: LEAD AND COPPER RULE REVISIONS, Groundwater Rule, Stage 1 Disinfectants and Disinfection Byproducts Rule, Interim Enhanced Surface Water Treatment Rule, Lead and Copper Rule and 2 others. 10 TRI-reporting industrial facilities are also located within the city limits.
A past EPA health-based registry row does not describe water delivered today or current compliance status; utilities notify customers and remediate under state primacy oversight when required. For current water-quality status and treatment practices, review your local utility's most recent Consumer Confidence Report or contact the Colorado drinking water program. All records above reflect federal EPA SDWIS data and are not independently verified against state databases.
Community Water Systems
| System Name | Pop. Served | Violations | Status |
|---|---|---|---|
| BOULDER CITY OF | 166,080 | 2 | Health |
| PINE BROOK HILLS WD | 1,100 | 0 | Clean |
| MILE HI WATER INC HAULER | 1,000 | 4 | Health |
| BASELINE WD | 820 | 0 | Clean |
| SHANNON WSD | 450 | 0 | Clean |
| EAST BOULDER COUNTY WD | 300 | 0 | Clean |
| LEFTHAND WSD LAKE PINES | 250 | 0 | Clean |
| SANS SOUCI COOPERATIVE | 150 | 19 | Health |
| GOLDEN POND VILLAGE MHP | 135 | 0 | Clean |
| SPRING VALLEY MUTUAL WA | 100 | 2 | Health |
| PINE LAKE VILLAGE | 65 | 1 | Health |
| DEER RUN MOBILE HOME COMMUNITY | 49 | 0 | Clean |
| 1610 LLC (WILLOW MANOR APTS) | 35 | 0 | Clean |
Does this city have health-based water violations?
These health-based records can represent Maximum Contaminant Level (MCL), Treatment Technique (TT), or Maximum Residual Disinfectant Level (MRDL) categories. A historical record does not establish that water is currently unsafe.
| Water system | Contaminant | Begin Date |
|---|---|---|
| PINE LAKE VILLAGE | LEAD AND COPPER RULE REVISIONS | 2026-01-02 |
| SANS SOUCI COOPERATIVE | Groundwater Rule | 2022-12-24 |
| SANS SOUCI COOPERATIVE | Groundwater Rule | 2022-12-24 |
| MILE HI WATER INC HAULER | Stage 1 Disinfectants and Disinfection Byproducts Rule | 2022-07-01 |
| MILE HI WATER INC HAULER | Stage 1 Disinfectants and Disinfection Byproducts Rule | 2022-07-01 |
| SANS SOUCI COOPERATIVE | Interim Enhanced Surface Water Treatment Rule | 2022-06-01 |
| SANS SOUCI COOPERATIVE | Interim Enhanced Surface Water Treatment Rule | 2022-06-01 |
| SANS SOUCI COOPERATIVE | Interim Enhanced Surface Water Treatment Rule | 2022-06-01 |
| SANS SOUCI COOPERATIVE | Interim Enhanced Surface Water Treatment Rule | 2022-06-01 |
| SANS SOUCI COOPERATIVE | Interim Enhanced Surface Water Treatment Rule | 2022-06-01 |
| SANS SOUCI COOPERATIVE | Interim Enhanced Surface Water Treatment Rule | 2022-06-01 |
| MILE HI WATER INC HAULER | Stage 1 Disinfectants and Disinfection Byproducts Rule | 2021-12-01 |
| SANS SOUCI COOPERATIVE | Interim Enhanced Surface Water Treatment Rule | 2020-06-01 |
| SANS SOUCI COOPERATIVE | Interim Enhanced Surface Water Treatment Rule | 2020-06-01 |
| SANS SOUCI COOPERATIVE | Interim Enhanced Surface Water Treatment Rule | 2020-05-01 |
| SANS SOUCI COOPERATIVE | Interim Enhanced Surface Water Treatment Rule | 2019-07-01 |
| SANS SOUCI COOPERATIVE | Interim Enhanced Surface Water Treatment Rule | 2019-07-01 |
| SANS SOUCI COOPERATIVE | Interim Enhanced Surface Water Treatment Rule | 2019-06-01 |
| SANS SOUCI COOPERATIVE | Lead and Copper Rule | 2019-04-01 |
| SPRING VALLEY MUTUAL WA | Lead and Copper Rule | 2018-12-27 |
| SANS SOUCI COOPERATIVE | Lead and Copper Rule | 2018-12-01 |
| SPRING VALLEY MUTUAL WA | Lead and Copper Rule | 2018-02-08 |
| BOULDER CITY OF | Total Haloacetic Acids (HAA5) | 2017-07-01 |
| SANS SOUCI COOPERATIVE | Interim Enhanced Surface Water Treatment Rule | 2017-06-01 |
| BOULDER CITY OF | Total Haloacetic Acids (HAA5) | 2017-04-01 |
| SANS SOUCI COOPERATIVE | Stage 1 Disinfectants and Disinfection Byproducts Rule | 2016-04-01 |
| MILE HI WATER INC HAULER | Stage 1 Disinfectants and Disinfection Byproducts Rule | 2015-09-01 |
| SANS SOUCI COOPERATIVE | Surface Water Treatment Rule | 2007-09-24 |
What are Boulder's health-based records for?
Boulder's health-based violation records carry 7 distinct EPA codes: some name a substance, others the drinking-water rule that was breached. Counts are records on file in the EPA SDWIS extract, not current test results.
| Contaminant | Records | Systems |
|---|---|---|
| Interim Enhanced Surface Water Treatment Rule | 13 | 1 |
| Stage 1 Disinfectants and Disinfection Byproducts Rule | 5 | 2 |
| Lead and Copper Rule | 4 | 2 |
| Groundwater Rule | 2 | 1 |
| Total Haloacetic Acids (HAA5) | 2 | 1 |
| Surface Water Treatment Rule | 1 | 1 |
| Lead and Copper Rule Revisions | 1 | 1 |
TRI Facilities in Boulder
| Facility | Total Releases |
|---|---|
| Micro Motion Inc. | 202.5K lbs |
| Corden Pharma Colorado Inc | 136.3K lbs |
| Corden Pharma Colorado Sterling Drive | 14.5K lbs |
| Agilent Technologies Boulder Co | 4.0K lbs |
| Dieterich Standard Inc | 1.4K lbs |
| National Institute of Standard&technology Boulder | 27 lbs |
| Smyrna Ready Mix Concrete LLC - Valmont Ready Mix | 2 lbs |
| Arcosa Esc Boulder | 0 lbs |
| Mks Instruments Inc Hps Pro Ducts Div | 0 lbs |
| Boulder Ready-Mix | 0 lbs |
Frequently Asked Questions
What does EPA SDWIS list for drinking water in Boulder, Colorado? ▼
How many water violations does Boulder have in this EPA extract? ▼
What contaminants were found in Boulder water? ▼
How many water systems serve Boulder? ▼
Where does Boulder get its drinking water? ▼
Are there pollution sources near Boulder? ▼
How does Boulder compare in Colorado?
Of the 313 Colorado places with at least one community water system on file, Boulder ranks #14 by number of systems (13).
Either side of it: Steamboat Springs (15), Aurora (14), Glendale (13), Centennial (12)
About This Data
Figures here are the current EPA SDWIS extract joined to the 13 community water systems whose service area lists Boulder, ranked against the 313 Colorado places with at least one system on file. Data current as of 2026-08-25.
Water system data comes from the EPA's Safe Drinking Water Information System (SDWIS). PlainEnviro's violation fetch is restricted upstream to records EPA flags as health-based and then joined to active community water systems. Monitoring and reporting violations are not included.
A health-based violation row in this extract is a historical EPA registry entry. It does not describe water delivered today or current compliance status. Many records are later resolved, and public water systems notify customers when required. For current conditions, contact your local water utility or the state drinking water program.
TRI facility data comes from the EPA Toxic Release Inventory. Facilities shown are those that self-report to the TRI program. PlainEnviro presents this data without advocacy framing.
Read our methodology - how this data is sourced, computed, and verified.