WESTPORT, SD · Brown County
GRASSLAND COLONY Water System
Inactive system
This water system is marked inactive in EPA’s federal records as of August 1, 2025. It is no longer an operating public water system under this PWSID, and no compliance deadlines — including the 2027 Consumer Confidence Report rule — apply to it.
If you are a resident looking for your current water provider, see water systems in Brown County, SD.
Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed August 1, 2026. This is a record-keeping and public-information tool — it does not replace South Dakota’s official records. Always confirm current status with South Dakota before making decisions based on this information.
System facts
- System ID (PWSID)
- SD4602028
- System type
- Community Water System
- Population served
- 130
- Service connections
- 30
- Ownership
- privately owned
- Water source
- surface water (rivers, lakes, or reservoirs)
GRASSLAND COLONY is one of 583 community water systems in South Dakota in the 500 or fewer people size category, formerly serving 130 people from surface water.
EPA's federal records list this system as inactive in 2025; the record below is historical.
As of August 1, 2026, its federal record holds 7 entries between 1990 and 2000, all of which EPA lists as closed. Nothing has been added since 2000.
Of the 7, 6 are monitoring and reporting requirements — the category that accounts for about four in five of all violations in EPA's national dataset — rather than findings about the water itself. The record involves volatile organic chemicals, the Total Coliform Rules, and the Lead and Copper Rule.
Violation history
Monitoring, Routine Major (TCR)
—Coliform (TCR)
March 1, 2000 – March 31, 2000
ResolvedMaximum Contaminant Level Violation, Acute (TCR)
Health-basedColiform (TCR)
July 1, 1999 – July 31, 1999
ResolvedMonitoring, Regular
—1,1,2-Trichloroethane
January 1, 1996 – December 31, 1996
ResolvedMonitoring, Regular
—CHLOROBENZENE
January 1, 1996 – December 31, 1996
ResolvedMonitoring, Regular
—o-Dichlorobenzene
January 1, 1996 – December 31, 1996
ResolvedInitial Tap Sampling for Pb and Cu
—Lead and Copper Rule
July 1, 1994 – July 24, 1997
ResolvedMonitoring, Regular
—Gross Alpha, Excl. Radon and U
November 5, 1990 – November 4, 1994
Resolved
Resolved addressed and confirmed by the state
| Period | Violation | Contaminant / rule | Health-based | Status |
|---|---|---|---|---|
| March 1, 2000 – March 31, 2000 | Monitoring, Routine Major (TCR) | Coliform (TCR) | — | Resolved |
| July 1, 1999 – July 31, 1999 | Maximum Contaminant Level Violation, Acute (TCR) | Coliform (TCR) | Health-based | Resolved |
| January 1, 1996 – December 31, 1996 | Monitoring, Regular | 1,1,2-Trichloroethane | — | Resolved |
| January 1, 1996 – December 31, 1996 | Monitoring, Regular | CHLOROBENZENE | — | Resolved |
| January 1, 1996 – December 31, 1996 | Monitoring, Regular | o-Dichlorobenzene | — | Resolved |
| July 1, 1994 – July 24, 1997 | Initial Tap Sampling for Pb and Cu | Lead and Copper Rule | — | Resolved |
| November 5, 1990 – November 4, 1994 | Monitoring, Regular | Gross Alpha, Excl. Radon and U | — | Resolved |
Resolved addressed and confirmed by the state
Enforcement actions
- April 1, 2016State Compliance achieved2 linked violations
- June 13, 2015State Intentional no-action2 linked violations
- February 16, 2010State Compliance achieved5 linked violations
- February 1, 2004State Compliance achieved1 linked violation
- July 23, 2003State Public Notification received2 linked violations
- October 1, 2000State Compliance achieved1 linked violation
- April 18, 2000State Public Notification received1 linked violation
- September 30, 1998State Compliance achieved35 linked violations
- September 18, 1998State Public Notification received2 linked violations
- September 11, 1998State Public Notification requested11 linked violations
- November 17, 1997State Administrative/Compliance Order without penalty issued35 linked violations
- July 24, 1997State Compliance achieved9 linked violations
- June 26, 1997State Compliance achieved26 linked violations
- March 1, 1997State Compliance achieved2 linked violations
- February 3, 1997State Intentional no-action3 linked violations
- August 12, 1996State Public Notification requested36 linked violations
- July 9, 1996State Compliance achieved3 linked violations
- April 24, 1996State Intentional no-action2 linked violations
- February 5, 1996State Public Notification received7 linked violations
Last known contact on file (system is inactive)
GRASSLAND COLONY
6054393603
WESTPORT, SD 57481