CEDAR GULCH 1
PWS ID: SD4602301 · RAPID CITY, South Dakota 57703
CEDAR GULCH 1 serves 45 people in RAPID CITY, South Dakota using Groundwater water sources. It has 282 recorded EPA violations, including 28 health-based violations. No PFAS contamination was detected in UCMR5 testing.
Water Quality Snapshot: CEDAR GULCH 1
CEDAR GULCH 1 is a private-owned community water system that delivers drinking water to 45 residents in RAPID CITY, South Dakota (Pennington County) through 14 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 282 total violations for this system , of which 28 (10%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 253 monitoring and reporting violations are on file. The most recent violation on record dates to 2025.
The most frequently cited contaminant at this system is Revised Total Coliform Rule, recorded in 37 violations (MON). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.
Across South Dakota, EPA tracks 654 public water systems serving 915,901 people, with 56,254 cumulative violations and 8,399 health-based violations on record. About 92% of systems in the state carry at least one violation, and state-wide the average per system is 86 violations. CEDAR GULCH 1's 282 violations sit above the South Dakota average. Statewide, 42 of 49 UCMR5-tested systems have reported PFAS detections (85.7%). All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.
System Details
- System Type
- Community
- Owner Type
- Private
- Connections
- 14
- County
- Pennington
- School/Daycare
- No
- MCL Violations
- 18
- Monitoring Violations
- 253
- Treatment Tech Violations
- 10
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Revised Total Coliform Rule | MON | 37 | 2019 |
| Combined Radium (-226 and -228) | MCL | 18 | 2014 |
| Coliform (TCR) | MR | 5 | 2014 |
| LASSO | MR | 4 | 2014 |
| Heptachlor epoxide | MR | 4 | 2014 |
| Benzo(a)pyrene | MR | 4 | 2014 |
| Methoxychlor | MR | 4 | 2014 |
| Di(2-ethylhexyl) phthalate | MR | 4 | 2014 |
| Hexachlorocyclopentadiene | MR | 4 | 2014 |
| BHC-GAMMA | MR | 4 | 2014 |
| Toxaphene | MR | 4 | 2014 |
| OXAMYL | MR | 4 | 2014 |
| Dalapon | MR | 4 | 2014 |
| Dinoseb | MR | 4 | 2014 |
| 2,4,5-TP | MR | 4 | 2014 |
| 2,4-D | MR | 4 | 2014 |
| 1,2-DIBROMO-3-CHLOROPROPANE | MR | 4 | 2014 |
| ETHYLENE DIBROMIDE | MR | 4 | 2014 |
| Glyphosate | MR | 4 | 2014 |
| Diquat | MR | 4 | 2014 |
| cis-1,2-Dichloroethylene | MR | 4 | 2014 |
| 1,1,1-Trichloroethane | MR | 4 | 2014 |
| Ethylbenzene | MR | 4 | 2014 |
| 1,1-Dichloroethylene | MR | 4 | 2014 |
| Carbon tetrachloride | MR | 4 | 2014 |
| CHLOROBENZENE | MR | 4 | 2014 |
| trans-1,2-Dichloroethylene | MR | 4 | 2014 |
| Benzene | MR | 4 | 2014 |
| p-Dichlorobenzene | MR | 4 | 2014 |
| DICHLOROMETHANE | MR | 4 | 2014 |
Verify This Water System
The figures above are aggregated from EPA's public databases. To verify the underlying records — or to file a complaint, request a Consumer Confidence Report, or check current monitoring status — go directly to the federal and state regulators that enforce the Safe Drinking Water Act for CEDAR GULCH 1.
EPA SDWIS — Federal Reports
EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:
View PWS ID SD4602301 on SDWISSource: EPA SDWIS Federal Reports Search
South Dakota Drinking Water Authority
South Dakota's primacy agency administers the Safe Drinking Water Act locally. Search EPA SDWIS for the current state contact, or use the state's public health or environment department portal.
Find SD regulator via EPA SDWISViolation Timeline
Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.
| Year (latest) | Contaminant | Category | Count | EPA Record |
|---|---|---|---|---|
| 2025 | Stage 1 Disinfectants and Disinfection Byproducts Rule | TT | 3 | SDWIS / SD4602301 / 0400 |
| 2019 | Revised Total Coliform Rule | MON | 37 | SDWIS / SD4602301 / 8000 |
| 2019 | Public Notice | Other | 1 | SDWIS / SD4602301 / 7500 |
| 2018 | Groundwater Rule | TT | 4 | SDWIS / SD4602301 / 0700 |
| 2017 | E. COLI | MR | 3 | SDWIS / SD4602301 / 3014 |
| 2017 | Revised Total Coliform Rule | TT | 3 | SDWIS / SD4602301 / 8000 |
| 2017 | Gross Alpha, Excl. Radon and U | MR | 2 | SDWIS / SD4602301 / 4000 |
| 2017 | Combined Uranium | MR | 2 | SDWIS / SD4602301 / 4006 |
| 2017 | Lead and Copper Rule | MR | 2 | SDWIS / SD4602301 / 5000 |
| 2017 | Combined Radium (-226 and -228) | MR | 2 | SDWIS / SD4602301 / 4010 |
| 2014 | Combined Radium (-226 and -228) | MCL | 18 | SDWIS / SD4602301 / 4010 |
| 2014 | Coliform (TCR) | MR | 5 | SDWIS / SD4602301 / 3100 |
| 2014 | LASSO | MR | 4 | SDWIS / SD4602301 / 2051 |
| 2014 | Heptachlor epoxide | MR | 4 | SDWIS / SD4602301 / 2067 |
| 2014 | Benzo(a)pyrene | MR | 4 | SDWIS / SD4602301 / 2306 |
How CEDAR GULCH 1 Compares
Cross-reference this system's record against state averages and the federal MCL framework for context.
| Metric | CEDAR GULCH 1 | South Dakota avg | Federal benchmark |
|---|---|---|---|
| Total violations | 282 | 86 | SDWA compliance — any non-zero count is a recorded breach |
| Health-based violations | 28 | 12.8 | Indicates a contaminant exceeded a federal MCL |
| PFAS detection | None | 85.7% | EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt |
| Population served | 45 | 1,400 | Sizing context for compliance burden |
Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 654 regulated public water systems in South Dakota.
Federal MCL reference — Safe Drinking Water Act thresholds ▼
| Contaminant | Federal MCL / Action Level | Note |
|---|---|---|
| Lead | 0 mg/L (Action Level: 0.015 mg/L) | Lead and Copper Rule treatment technique |
| Arsenic | 0.010 mg/L (10 ppb) | Health-based MCL since 2006 |
| Total Coliform | Treatment technique (RTCR) | Indicator organism, monitoring trigger |
| PFOA / PFOS (PFAS) | 4.0 ppt each (final 2024 rule) | Compliance deadline 2029 |
| Nitrate (as N) | 10 mg/L | Acute health risk for infants |
Frequently Asked Questions
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Related Data for South Dakota
Read our methodology — how this data is sourced, computed, and verified.