DARLINGTON ESTATES
PWSID: SD4600403 · Rapid City, SD · Serves 25 people
According to EPA Safe Drinking Water Information System (SDWIS), DARLINGTON ESTATES (PWSID SD4600403) in Rapid City, SD is listed as a CWS water system covering about 25 people. The same extract lists 4 health-based violation records spanning 2025-2025. Those 4 health-based rows for DARLINGTON ESTATES cover contaminants such as Combined Radium (-226 and -228), Stage 1 Disinfectants and Disinfection Byproducts Rule; they remain historical EPA registry entries, not a current compliance or drinkability score.
DARLINGTON ESTATES has 4 health-based violation records in this historical extract. Monitoring and reporting records are not included.
PlainEnviro's health-based SDWIS extract covers monitoring and reporting violations only -- it does not include unresolved enforcement actions in progress or corrective steps a utility has taken since the extract date. 2 distinct EPA contaminant codes appear in this system's record, including Combined Radium (-226 and -228), Stage 1 Disinfectants and Disinfection Byproducts Rule. Recorded violations span 2025–2025. Day-to-day primacy enforcement for this system runs through the South Dakota drinking-water program, not EPA directly.
A historical health-based record does not necessarily describe current water quality or compliance. The most authoritative current source is the utility's annual Consumer Confidence Report. For enforcement history and corrective-action orders, consult EPA ECHO and the South Dakota state drinking-water program's public portal.
System Details
- EPA ID (PWSID)
- SD4600403
- System Type
- CWS
- Water Source
- Groundwater
- Location
- Rapid City, SD
- Population Served
- 25
- Health Violations
- Yes (4)
What contaminants are in this water system?
| Contaminant | Violations | Health-Based |
|---|---|---|
| Combined Radium (-226 and -228) | 3 | 3 |
| Stage 1 Disinfectants and Disinfection Byproducts Rule | 1 | 1 |
Violation History (4)
| Contaminant | Health | Date |
|---|---|---|
| Stage 1 Disinfectants and Disinfection Byproducts Rule | Yes | Nov 12, 2025 |
| Combined Radium (-226 and -228) | Yes | Oct 1, 2025 |
| Combined Radium (-226 and -228) | Yes | Jul 1, 2025 |
| Combined Radium (-226 and -228) | Yes | Jul 1, 2025 |
Frequently Asked Questions
What does EPA SDWIS list for DARLINGTON ESTATES?
How many people does DARLINGTON ESTATES serve?
What violations does DARLINGTON ESTATES have?
What contaminants have been found in DARLINGTON ESTATES water?
Compare beyond South Dakota
Nationwide peers by violations & population served
Cross-state SDWIS systems nearest DARLINGTON ESTATES on cumulative violation count (4) and EPA-reported population served (25). Violation-count peers include Santo Domingo Pueblo, Isleta Eastside, PARSHALL-LUCKY MOUND.
Similar violation count
Nearest cross-state community systems (500+ served) by SDWIS violations on record.
Nearby Water Systems
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About This Data
DARLINGTON ESTATES (SD4600403) is drawn from EPA SDWIS. Nearby county systems in this extract include RAPID CITY; RAPID VALLEY SANITARY DISTRICT; COLONIAL PINE HILLS SANITARY DISTRIC; HILL CITY. Health-based rows (4 MCL/TT) are historical registry state, not a current drinkability score.
Source: U.S. Environmental Protection Agency, SDWIS Federal Reporting Services
Read our methodology - how this data is sourced, computed, and verified.