KEYSTONE
South Dakota - Community Water System - PWSID: SD4601082
System Information
| PWSID | SD4601082 |
| System Name | KEYSTONE |
| System Type | Community Water System |
| Water Source | Ground Water |
| Activity Status | Active |
| Owner Type | Local |
| EPA Region | 08 |
| Serves School | No |
| Wholesaler | No |
| First Reported | Dec 7, 1987 |
| Last Reported | Mar 2, 2026 |
Location & Contact
| State | South Dakota |
| City | KEYSTONE |
| ZIP Code | 57751 |
| Address | PO BOX 689 |
| Organization | KEYSTONE |
| Phone | 6056664827 |
Population & Service
| Population Served | 349 |
| Service Connections | 249 |
Drinking Water Violations (50)
This water system has 50 violations recorded in the EPA SDWIS database.
| Begin Date | End Date | Contaminant | Category | Health-Based | Major | Measured | Federal MCL | State MCL | Status | Return to Compliance | Rule |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jan 1, 2019 | Mar 31, 2019 | MR | No | Yes | - | 5 pCi/L | - | Resolved | Mar 31, 2019 | - | |
| Jan 1, 2019 | Mar 31, 2019 | MR | No | Yes | - | 5 pCi/L | - | Resolved | Mar 31, 2019 | - | |
| Jan 1, 2019 | Mar 31, 2019 | MR | No | Yes | - | 5 pCi/L | - | Resolved | Mar 31, 2019 | - | |
| Jan 1, 2019 | Mar 31, 2019 | MR | No | Yes | - | 30 ug/L | - | Resolved | Mar 31, 2019 | - | |
| Jan 1, 2019 | Mar 31, 2019 | MR | No | Yes | - | 30 ug/L | - | Resolved | Mar 31, 2019 | - | |
| Jan 1, 2019 | Mar 31, 2019 | MR | No | Yes | - | 30 ug/L | - | Resolved | Mar 31, 2019 | - | |
| Jan 1, 2019 | Mar 31, 2019 | MR | No | Yes | - | 15 pCi/L | - | Resolved | Mar 31, 2019 | - | |
| Jan 1, 2019 | Mar 31, 2019 | MR | No | Yes | - | 15 pCi/L | - | Resolved | Mar 31, 2019 | - | |
| Jan 1, 2019 | Mar 31, 2019 | MR | No | Yes | - | 15 pCi/L | - | Resolved | Mar 31, 2019 | - | |
| Oct 1, 2015 | Oct 31, 2015 | MCL | Yes | No | - | 5% of samples | - | Resolved | Oct 31, 2015 | - | |
| Oct 1, 2015 | Oct 31, 2015 | MCL | Yes | No | - | 5% of samples | - | Resolved | Oct 31, 2015 | - | |
| Oct 1, 2015 | Oct 31, 2015 | MCL | Yes | No | - | 5% of samples | - | Resolved | Oct 31, 2015 | - | |
| Sep 1, 2015 | Sep 30, 2015 | MCL | Yes | No | - | 5% of samples | - | Resolved | Sep 30, 2015 | - | |
| Sep 1, 2015 | Sep 30, 2015 | MCL | Yes | No | - | 5% of samples | - | Resolved | Sep 30, 2015 | - | |
| Sep 1, 2015 | Sep 30, 2015 | MCL | Yes | No | - | 5% of samples | - | Resolved | Sep 30, 2015 | - | |
| Sep 1, 2015 | Sep 30, 2015 | MCL | Yes | No | - | 5% of samples | - | Resolved | Sep 30, 2015 | - | |
| Jun 1, 2015 | Jun 30, 2015 | MCL | Yes | No | - | 5% of samples | - | Resolved | Jun 30, 2015 | - | |
| Jun 1, 2015 | Jun 30, 2015 | MCL | Yes | No | - | 5% of samples | - | Resolved | Jun 30, 2015 | - | |
| Jun 1, 2015 | Jun 30, 2015 | MCL | Yes | No | - | 5% of samples | - | Resolved | Jun 30, 2015 | - | |
| Jun 1, 2015 | Jun 30, 2015 | MCL | Yes | No | - | 5% of samples | - | Resolved | Jun 30, 2015 | - | |
| Oct 1, 2010 | - | MR | No | No | - | TT | - | Resolved | Sep 7, 2011 | - | |
| Oct 1, 2010 | - | MR | No | No | - | TT | - | Resolved | Sep 7, 2011 | - | |
| Oct 1, 2010 | - | MR | No | No | - | TT | - | Resolved | Sep 7, 2011 | - | |
| Jul 1, 2000 | Aug 9, 2000 | Other | No | Yes | - | - | - | Resolved | Aug 9, 2000 | - | |
| Jul 1, 2000 | Aug 9, 2000 | Other | No | Yes | - | - | - | Resolved | Aug 9, 2000 | - | |
| Sep 1, 1995 | Sep 30, 1995 | MCL | Yes | No | - | 5% of samples | - | Resolved | Sep 30, 1995 | - | |
| Sep 1, 1995 | Sep 30, 1995 | MCL | Yes | No | - | 5% of samples | - | Resolved | Sep 30, 1995 | - | |
| Sep 1, 1995 | Sep 30, 1995 | MCL | Yes | No | - | 5% of samples | - | Resolved | Sep 30, 1995 | - | |
| Nov 8, 1989 | Nov 7, 1992 | MR | No | Yes | - | 0.005 mg/L | - | Resolved | Nov 7, 1992 | - | |
| Nov 8, 1989 | Nov 7, 1992 | MR | No | Yes | - | 0.05 mg/L | - | Resolved | Nov 7, 1992 | - | |
| Nov 8, 1989 | Nov 7, 1992 | MR | No | Yes | - | 0.05 mg/L | - | Resolved | Nov 7, 1992 | - | |
| Nov 8, 1989 | Nov 7, 1992 | MR | No | Yes | - | 0.05 mg/L | - | Resolved | Nov 7, 1992 | - | |
| Nov 8, 1989 | Nov 7, 1992 | MR | No | Yes | - | 0.005 mg/L | - | Resolved | Nov 7, 1992 | - | |
| Nov 8, 1989 | Nov 7, 1992 | MR | No | Yes | - | 0.010 mg/L | - | Resolved | Nov 7, 1992 | - | |
| Nov 8, 1989 | Nov 7, 1992 | MR | No | Yes | - | 0.010 mg/L | - | Resolved | Nov 7, 1992 | - | |
| Nov 8, 1989 | Nov 7, 1992 | MR | No | Yes | - | 0.005 mg/L | - | Resolved | Nov 7, 1992 | - | |
| Nov 8, 1989 | Nov 7, 1992 | MR | No | Yes | - | 2 mg/L | - | Resolved | Nov 7, 1992 | - | |
| Nov 8, 1989 | Nov 7, 1992 | MR | No | Yes | - | 0.010 mg/L | - | Resolved | Nov 7, 1992 | - | |
| Nov 8, 1989 | Nov 7, 1992 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Nov 7, 1992 | - | |
| Nov 8, 1989 | Nov 7, 1992 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Nov 7, 1992 | - | |
| Nov 8, 1989 | Nov 7, 1992 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Nov 7, 1992 | - | |
| Nov 8, 1989 | Nov 7, 1992 | MR | No | Yes | - | 0.002 mg/L | - | Resolved | Nov 7, 1992 | - | |
| Nov 8, 1989 | Nov 7, 1992 | MR | No | Yes | - | 0.002 mg/L | - | Resolved | Nov 7, 1992 | - | |
| Nov 8, 1989 | Nov 7, 1992 | MR | No | Yes | - | 0.002 mg/L | - | Resolved | Nov 7, 1992 | - | |
| Nov 8, 1989 | Nov 7, 1992 | MR | No | Yes | - | 0.1 mg/L | - | Resolved | Nov 7, 1992 | - | |
| Nov 8, 1989 | Nov 7, 1992 | MR | No | Yes | - | 0.1 mg/L | - | Resolved | Nov 7, 1992 | - | |
| Nov 8, 1989 | Nov 7, 1992 | MR | No | Yes | - | 0.1 mg/L | - | Resolved | Nov 7, 1992 | - | |
| Nov 8, 1989 | Nov 7, 1992 | MR | No | Yes | - | 2 mg/L | - | Resolved | Nov 7, 1992 | - | |
| Nov 8, 1989 | Nov 7, 1992 | MR | No | Yes | - | 2 mg/L | - | Resolved | Nov 7, 1992 | - | |
| - | - | - | No | No | - | - | - | - | - | - |
About This Water System
Public water system data comes from the EPA Safe Drinking Water Information System (SDWIS). Systems with violations must notify customers. Contact your water utility for the latest annual water quality report.