St Maries Water Quality
Idaho
According to EPA SDWIS, St Maries, Idaho is served by 5 community water systems covering about 4,586 people. The same extract lists 14 health-based violation records, most recently coded 1005 in 2024. Counts are historical EPA registry rows, not a current compliance or drinkability score.
Drinking water in St Maries, Idaho is delivered through 5 EPA-regulated community water systems serving an estimated 4,586 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 14 violation records across the 5 active community systems shown here. Monitoring and reporting records are not present in the extract. The records carry 5 distinct EPA contaminant codes: Arsenic, Gross Alpha, Excl. Radon and U, Combined Uranium, Coliform (TCR), Surface Water Treatment Rule.
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 Idaho 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 |
|---|---|---|---|
| ST MARIES CITY OF | 4,173 | 1 | Health |
| COTTONWOOD POINT WATER ASSN | 151 | 0 | Clean |
| EMIDA WATER AND SEWER ASSOCIATION | 120 | 3 | Health |
| EVERGREEN TERRACE WATER ASSOCIATION | 85 | 0 | Clean |
| CASSANDRA HILLS OWNERS ASSN | 57 | 10 | Health |
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 |
|---|---|---|
| CASSANDRA HILLS OWNERS ASSN | Arsenic | 2024-04-01 |
| CASSANDRA HILLS OWNERS ASSN | Arsenic | 2024-04-01 |
| CASSANDRA HILLS OWNERS ASSN | Arsenic | 2024-04-01 |
| CASSANDRA HILLS OWNERS ASSN | Arsenic | 2024-04-01 |
| CASSANDRA HILLS OWNERS ASSN | Gross Alpha, Excl. Radon and U | 2018-07-01 |
| CASSANDRA HILLS OWNERS ASSN | Gross Alpha, Excl. Radon and U | 2018-04-01 |
| CASSANDRA HILLS OWNERS ASSN | Combined Uranium | 2018-01-01 |
| CASSANDRA HILLS OWNERS ASSN | Gross Alpha, Excl. Radon and U | 2018-01-01 |
| CASSANDRA HILLS OWNERS ASSN | Gross Alpha, Excl. Radon and U | 2017-10-01 |
| CASSANDRA HILLS OWNERS ASSN | Gross Alpha, Excl. Radon and U | 2017-07-01 |
| EMIDA WATER AND SEWER ASSOCIATION | Coliform (TCR) | 2015-07-01 |
| EMIDA WATER AND SEWER ASSOCIATION | Coliform (TCR) | 2015-07-01 |
| EMIDA WATER AND SEWER ASSOCIATION | Coliform (TCR) | 2015-07-01 |
| ST MARIES CITY OF | Surface Water Treatment Rule | 1993-07-01 |
What are St Maries's health-based records for?
St Maries's health-based violation records carry 5 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 |
|---|---|---|
| Gross Alpha, Excl. Radon and U | 5 | 1 |
| Arsenic | 4 | 1 |
| Coliform (TCR) | 3 | 1 |
| Surface Water Treatment Rule | 1 | 1 |
| Combined Uranium | 1 | 1 |
Frequently Asked Questions
What does EPA SDWIS list for drinking water in St Maries, Idaho? ▼
How many water violations does St Maries have in this EPA extract? ▼
What contaminants were found in St Maries water? ▼
How many water systems serve St Maries? ▼
Where does St Maries get its drinking water? ▼
How does St Maries compare in Idaho?
Of the 216 Idaho places with at least one community water system on file, St Maries ranks #40 by number of systems (5).
Either side of it: Rexburg (5), Salmon (5), Donnelly (4), Hagerman (4)
About This Data
Figures here are the current EPA SDWIS extract joined to the 5 community water systems whose service area lists St Maries, ranked against the 216 Idaho 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.