CUSTER
PWS ID: SD4600101 · CUSTER, South Dakota 57730
CUSTER serves 1,919 people in CUSTER, South Dakota using Groundwater water sources. It has 112 recorded EPA violations, including 0 health-based violations. No PFAS contamination was detected in UCMR5 testing.
Water Quality Snapshot: CUSTER
CUSTER is a local-owned community water system that delivers drinking water to 1,919 residents in CUSTER, South Dakota (Custer County) through 1,200 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 112 total violations for this system , of which 0 (0%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 110 monitoring and reporting violations are on file. The most recent violation on record dates to 1998.
The most frequently cited contaminant at this system is Lead and Copper Rule, recorded in 6 violations (MR). 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. CUSTER's 112 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
- Local
- Connections
- 1,200
- County
- Custer
- School/Daycare
- No
- MCL Violations
- 0
- Monitoring Violations
- 110
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Lead and Copper Rule | MR | 6 | 1998 |
| Heptachlor epoxide | MR | 3 | 1996 |
| Atrazine | MR | 3 | 1996 |
| Benzo(a)pyrene | MR | 3 | 1996 |
| Methoxychlor | MR | 3 | 1996 |
| Di(2-ethylhexyl) phthalate | MR | 3 | 1996 |
| Hexachlorocyclopentadiene | MR | 3 | 1996 |
| Endrin | MR | 3 | 1996 |
| Toxaphene | MR | 3 | 1996 |
| Aldicarb sulfoxide | MR | 3 | 1996 |
| OXAMYL | MR | 3 | 1996 |
| Dalapon | MR | 3 | 1996 |
| Dinoseb | MR | 3 | 1996 |
| 2,4,5-TP | MR | 3 | 1996 |
| Pentachlorophenol | MR | 3 | 1996 |
| 2,4-D | MR | 3 | 1996 |
| Endothall | MR | 3 | 1996 |
| Glyphosate | MR | 3 | 1996 |
| Diquat | MR | 3 | 1996 |
| Gross Alpha, Excl. Radon and U | MR | 3 | 1988 |
| Combined Radium (-226 and -228) | MR | 3 | 1988 |
| HEXACHLOROBENZENE | MR | 3 | 1996 |
| ETHYLENE DIBROMIDE | MR | 3 | 1996 |
| Simazine | MR | 3 | 1996 |
| 1,2-DIBROMO-3-CHLOROPROPANE | MR | 3 | 1996 |
| Di(2-ethylhexyl) adipate | MR | 3 | 1996 |
| LASSO | MR | 3 | 1996 |
| BHC-GAMMA | MR | 3 | 1996 |
| Picloram | MR | 3 | 1996 |
| Heptachlor | MR | 3 | 1996 |
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 CUSTER.
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 SD4600101 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 |
|---|---|---|---|---|
| 1998 | Lead and Copper Rule | MR | 6 | SDWIS / SD4600101 / 5000 |
| 1996 | Heptachlor epoxide | MR | 3 | SDWIS / SD4600101 / 2067 |
| 1996 | Atrazine | MR | 3 | SDWIS / SD4600101 / 2050 |
| 1996 | Benzo(a)pyrene | MR | 3 | SDWIS / SD4600101 / 2306 |
| 1996 | Methoxychlor | MR | 3 | SDWIS / SD4600101 / 2015 |
| 1996 | Di(2-ethylhexyl) phthalate | MR | 3 | SDWIS / SD4600101 / 2039 |
| 1996 | Hexachlorocyclopentadiene | MR | 3 | SDWIS / SD4600101 / 2042 |
| 1996 | Endrin | MR | 3 | SDWIS / SD4600101 / 2005 |
| 1996 | Toxaphene | MR | 3 | SDWIS / SD4600101 / 2020 |
| 1996 | Aldicarb sulfoxide | MR | 3 | SDWIS / SD4600101 / 2043 |
| 1996 | OXAMYL | MR | 3 | SDWIS / SD4600101 / 2036 |
| 1996 | Dalapon | MR | 3 | SDWIS / SD4600101 / 2031 |
| 1996 | Dinoseb | MR | 3 | SDWIS / SD4600101 / 2041 |
| 1996 | 2,4,5-TP | MR | 3 | SDWIS / SD4600101 / 2110 |
| 1996 | Pentachlorophenol | MR | 3 | SDWIS / SD4600101 / 2326 |
How CUSTER Compares
Cross-reference this system's record against state averages and the federal MCL framework for context.
| Metric | CUSTER | South Dakota avg | Federal benchmark |
|---|---|---|---|
| Total violations | 112 | 86 | SDWA compliance — any non-zero count is a recorded breach |
| Health-based violations | 0 | 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 | 1,919 | 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
Is CUSTER water safe to drink? ▼
How many people does CUSTER serve? ▼
What type of violations does CUSTER have? ▼
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Related Data for South Dakota
Read our methodology — how this data is sourced, computed, and verified.