Public water system record
Keystone
Serves Keystone, Pennington County, SD · 349 people served
Federal records show no health-based violations and 3 monitoring/reporting issues for Keystone 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
- 3
Key facts
- Keystone draws water from 5 wells.
- Record on file since 1989, with 4 health-based violations before October 20, 2016.
- Lead pipe inventory: 1 lead and 293 unknown out of 299 service lines.
Check whether Keystone 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 |
|---|---|---|
|
Combined Uranium
Monitoring and reporting
|
Jan 1, 2019 | Resolved |
|
Combined Radium (-226 and -228)
Monitoring and reporting
|
Jan 1, 2019 | Resolved |
|
Gross Alpha, Excl. Radon and U
Monitoring and reporting
|
Jan 1, 2019 | Resolved |
Full record since 1989
EPA's records for Keystone go back to 1989. Before October 20, 2016 they list 4 health-based violations (4 resolved) and 9 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1980s | 0 | 7 |
| 1990s | 1 | 0 |
| 2000s | 0 | 1 |
| 2010 to October 19, 2016 | 3 | 1 |
| October 20, 2016 to 2019 | 0 | 3 |
Most recent health-based violation before October 20, 2016: Total Coliform, began October 2015, Resolved.
Show all 4 health-based violations before October 20, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Total Coliform
Contaminant limit exceeded
|
Oct 1, 2015 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Sep 1, 2015 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Jun 1, 2015 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Sep 1, 1995 | Resolved |
Where the water comes from
Keystone draws water from 5 wells.
Annual water quality report
Keystone 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 500 or fewer people may meet the rule by telling customers the report is available on request, so you may need to ask Keystone for a copy.
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 South Dakota.
Certified drinking water labs by state EPA guidance for private wells