Spearfish Water Quality
South Dakota
According to EPA SDWIS, Spearfish, South Dakota is served by 20 community water systems covering about 15,694 people. The same extract lists 70 health-based violation records, most recently coded 0700 in 2025. Counts are historical EPA registry rows, not a current compliance or drinkability score.
Drinking water in Spearfish, South Dakota is delivered through 20 EPA-regulated community water systems serving an estimated 15,694 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 70 violation records across the 20 active community systems shown here. Monitoring and reporting records are not present in the extract. The records carry 6 distinct EPA contaminant codes: Groundwater Rule, LEAD AND COPPER RULE REVISIONS, Stage 1 Disinfectants and Disinfection Byproducts Rule, Revised Total Coliform Rule, Combined Radium (-226 and -228) and 1 others.
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 South Dakota 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 |
|---|---|---|---|
| SPEARFISH | 13,803 | 0 | Clean |
| MOUNTAIN PLAINS 2 HOMEOWNERS ASSOC | 268 | 2 | Health |
| SAINT ONGE SEWER & WATER CO | 255 | 0 | Clean |
| LANTERN ESTATES | 192 | 0 | Clean |
| WALNUT PARK | 180 | 10 | Health |
| SPEARFISH VALLEY MOBILE ESTATES | 163 | 2 | Health |
| KEN'S TRAILER COURT | 110 | 0 | Clean |
| WESTFIELD ADDITION | 104 | 0 | Clean |
| WESTVIEW HOMEOWNERS ASSOCIATION | 103 | 0 | Clean |
| LOURIE LANE HOMEOWNERS ASSOC | 75 | 2 | Health |
| RIVERSIDE MOBILE HOME COURT | 75 | 3 | Health |
| SPRING CREEK PRESERVE | 68 | 0 | Clean |
| MEADOW CREST SANITARY DISTRICT | 63 | 32 | Health |
| DEBERG WELL USERS ASSOCIATION | 54 | 1 | Health |
| SUNRISE HOMEOWNERS ASSOCIATION | 50 | 3 | Health |
| TWO BIT RANCH ESTATES | 30 | 0 | Clean |
| REYNOLDS COURT | 28 | 9 | Health |
| CHRIS' MOBILE HOME COURT | 25 | 0 | Clean |
| CENTENNIAL HILLS HOME ASSOCIATION | 25 | 0 | Clean |
| BICENTENNIAL TRAILER COURT | 23 | 6 | 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 |
|---|---|---|
| MOUNTAIN PLAINS 2 HOMEOWNERS ASSOC | Groundwater Rule | 2025-10-31 |
| WALNUT PARK | LEAD AND COPPER RULE REVISIONS | 2024-10-17 |
| REYNOLDS COURT | LEAD AND COPPER RULE REVISIONS | 2024-10-17 |
| SPEARFISH VALLEY MOBILE ESTATES | Stage 1 Disinfectants and Disinfection Byproducts Rule | 2021-10-01 |
| SPEARFISH VALLEY MOBILE ESTATES | Stage 1 Disinfectants and Disinfection Byproducts Rule | 2021-10-01 |
| REYNOLDS COURT | Groundwater Rule | 2020-11-20 |
| LOURIE LANE HOMEOWNERS ASSOC | Groundwater Rule | 2020-11-18 |
| LOURIE LANE HOMEOWNERS ASSOC | Revised Total Coliform Rule | 2020-11-06 |
| MEADOW CREST SANITARY DISTRICT | Combined Radium (-226 and -228) | 2020-10-01 |
| MEADOW CREST SANITARY DISTRICT | Gross Alpha, Excl. Radon and U | 2020-10-01 |
| MEADOW CREST SANITARY DISTRICT | Combined Radium (-226 and -228) | 2020-07-01 |
| MEADOW CREST SANITARY DISTRICT | Gross Alpha, Excl. Radon and U | 2020-07-01 |
| MEADOW CREST SANITARY DISTRICT | Combined Radium (-226 and -228) | 2020-04-01 |
| MEADOW CREST SANITARY DISTRICT | Gross Alpha, Excl. Radon and U | 2020-04-01 |
| MEADOW CREST SANITARY DISTRICT | Combined Radium (-226 and -228) | 2020-01-01 |
| MEADOW CREST SANITARY DISTRICT | Gross Alpha, Excl. Radon and U | 2020-01-01 |
| MEADOW CREST SANITARY DISTRICT | Combined Radium (-226 and -228) | 2019-10-01 |
| MEADOW CREST SANITARY DISTRICT | Gross Alpha, Excl. Radon and U | 2019-10-01 |
| MEADOW CREST SANITARY DISTRICT | Combined Radium (-226 and -228) | 2019-07-01 |
| MEADOW CREST SANITARY DISTRICT | Gross Alpha, Excl. Radon and U | 2019-07-01 |
| MEADOW CREST SANITARY DISTRICT | Combined Radium (-226 and -228) | 2019-04-01 |
| MEADOW CREST SANITARY DISTRICT | Gross Alpha, Excl. Radon and U | 2019-04-01 |
| WALNUT PARK | Stage 1 Disinfectants and Disinfection Byproducts Rule | 2019-02-01 |
| REYNOLDS COURT | Stage 1 Disinfectants and Disinfection Byproducts Rule | 2019-02-01 |
| MEADOW CREST SANITARY DISTRICT | Combined Radium (-226 and -228) | 2019-01-01 |
| MEADOW CREST SANITARY DISTRICT | Gross Alpha, Excl. Radon and U | 2019-01-01 |
| BICENTENNIAL TRAILER COURT | Stage 1 Disinfectants and Disinfection Byproducts Rule | 2018-10-16 |
| BICENTENNIAL TRAILER COURT | Stage 1 Disinfectants and Disinfection Byproducts Rule | 2018-10-16 |
| WALNUT PARK | Groundwater Rule | 2018-10-02 |
| MEADOW CREST SANITARY DISTRICT | Combined Radium (-226 and -228) | 2018-10-01 |
| MEADOW CREST SANITARY DISTRICT | Gross Alpha, Excl. Radon and U | 2018-10-01 |
| MEADOW CREST SANITARY DISTRICT | Combined Radium (-226 and -228) | 2018-07-01 |
| MEADOW CREST SANITARY DISTRICT | Gross Alpha, Excl. Radon and U | 2018-07-01 |
| WALNUT PARK | Stage 1 Disinfectants and Disinfection Byproducts Rule | 2018-05-16 |
| REYNOLDS COURT | Stage 1 Disinfectants and Disinfection Byproducts Rule | 2018-05-16 |
| MEADOW CREST SANITARY DISTRICT | Combined Radium (-226 and -228) | 2018-04-01 |
| MEADOW CREST SANITARY DISTRICT | Gross Alpha, Excl. Radon and U | 2018-04-01 |
| BICENTENNIAL TRAILER COURT | Stage 1 Disinfectants and Disinfection Byproducts Rule | 2018-02-01 |
| BICENTENNIAL TRAILER COURT | Stage 1 Disinfectants and Disinfection Byproducts Rule | 2018-02-01 |
| MEADOW CREST SANITARY DISTRICT | Combined Radium (-226 and -228) | 2018-01-01 |
| MEADOW CREST SANITARY DISTRICT | Gross Alpha, Excl. Radon and U | 2018-01-01 |
| MOUNTAIN PLAINS 2 HOMEOWNERS ASSOC | Groundwater Rule | 2017-10-25 |
| MEADOW CREST SANITARY DISTRICT | Combined Radium (-226 and -228) | 2017-10-01 |
| MEADOW CREST SANITARY DISTRICT | Gross Alpha, Excl. Radon and U | 2017-10-01 |
| MEADOW CREST SANITARY DISTRICT | Combined Radium (-226 and -228) | 2017-07-01 |
| MEADOW CREST SANITARY DISTRICT | Gross Alpha, Excl. Radon and U | 2017-07-01 |
| WALNUT PARK | Stage 1 Disinfectants and Disinfection Byproducts Rule | 2017-05-01 |
| REYNOLDS COURT | Stage 1 Disinfectants and Disinfection Byproducts Rule | 2017-05-01 |
| MEADOW CREST SANITARY DISTRICT | Combined Radium (-226 and -228) | 2017-04-01 |
| MEADOW CREST SANITARY DISTRICT | Gross Alpha, Excl. Radon and U | 2017-04-01 |
What are Spearfish's health-based records for?
Spearfish's health-based violation records carry 6 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 |
|---|---|---|
| Stage 1 Disinfectants and Disinfection Byproducts Rule | 29 | 7 |
| Gross Alpha, Excl. Radon and U | 16 | 1 |
| Combined Radium (-226 and -228) | 16 | 1 |
| Groundwater Rule | 6 | 4 |
| Lead and Copper Rule Revisions | 2 | 2 |
| Revised Total Coliform Rule | 1 | 1 |
Frequently Asked Questions
What does EPA SDWIS list for drinking water in Spearfish, South Dakota? ▼
How many water violations does Spearfish have in this EPA extract? ▼
What contaminants were found in Spearfish water? ▼
How many water systems serve Spearfish? ▼
Where does Spearfish get its drinking water? ▼
How does Spearfish compare in South Dakota?
Of the 230 South Dakota places with at least one community water system on file, Spearfish ranks #4 by number of systems (20).
Either side of it: Black Hawk (41), Piedmont (25), Pine Ridge (18), Aberdeen (14)
About This Data
Figures here are the current EPA SDWIS extract joined to the 20 community water systems whose service area lists Spearfish, ranked against the 230 South Dakota 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.