Transient Non-Community Water System · PWS SD4600049
Csp-Hidden Valley
Operator location Custer, South Dakota - 0% of 71 violations are health-based (lower-third health share (≤ 1%)); groundwater source; 45 served per SDWIS.
- 45
- People served (this PWS)
- 71
- EPA violations (this PWS)
- 0
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Csp-Hidden Valley standing, mid SDWIS violation third
0% of 71 recorded violations are health-based - lower-third health share (≤ 1%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 0% is lower-third health share (≤ 1%).
The verdict
Csp-Hidden Valley lands in the middle third by violation volume (71), large enough for peer comparisons without matching the fleet's heaviest ledgers. Population served is smaller (45; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is only 0% - almost all of this trail is monitoring or reporting. No UCMR5 PFAS test appears for this system in this extract.
- 71
- Total EPA violations on record
- 0%
- Health-based (MCL / treatment failure)
- 45
- People served by this PWS (SDWIS)
- N/A
- PFAS compounds detected (UCMR5)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
System Details
- System Type
- Transient Non-Community
- Owner Type
- State
- Connections
- 14
- County
- Custer
- School/Daycare
- No
- MCL Violations
- 0
- Monitoring Violations
- 58
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 7 | 1998 |
| Lead and Copper Rule | MR | 3 | 1998 |
| Lead and Copper Rule | Other | 3 | 1999 |
| TTHM | MR | 2 | 2005 |
| Vinyl chloride | MR | 2 | 1993 |
| 1,1,1-Trichloroethane | MR | 2 | 1993 |
| Ethylbenzene | MR | 2 | 1993 |
| 1,2,4-Trichlorobenzene | MR | 2 | 1993 |
| 1,1,2-Trichloroethane | MR | 2 | 1993 |
| Xylenes, Total | MR | 2 | 1993 |
| Carbon tetrachloride | MR | 2 | 1993 |
| CHLOROBENZENE | MR | 2 | 1993 |
| o-Dichlorobenzene | MR | 2 | 1993 |
| trans-1,2-Dichloroethylene | MR | 2 | 1993 |
| Trichloroethylene | MR | 2 | 1993 |
| Toluene | MR | 2 | 1993 |
| DICHLOROMETHANE | MR | 2 | 1993 |
| Styrene | MR | 2 | 1993 |
| p-Dichlorobenzene | MR | 2 | 1993 |
| Benzene | MR | 2 | 1993 |
| Tetrachloroethylene | MR | 2 | 1993 |
| Total Haloacetic Acids (HAA5) | MR | 2 | 2005 |
| cis-1,2-Dichloroethylene | MR | 2 | 1993 |
| 1,2-Dichloroethane | MR | 2 | 1993 |
| 1,2-Dichloropropane | MR | 2 | 1993 |
| 1,1-Dichloroethylene | MR | 2 | 1993 |
| Gross Alpha, Excl. Radon and U | MR | 1 | 1976 |
| Combined Radium (-226 and -228) | MR | 1 | 1976 |
Violation Count vs. the National Corpus
Csp-Hidden Valley has 71 recorded EPA violations, 65% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 34% carry more. 0% of this system's own violations are health-based (0 of 71), and it ranks unranked by population served among that same cohort.
EPA violations vs. the national water-system corpus
Public water systems serving 500+ people (EPA SDWIS)
71 Around the middle fewer violations than 34% of 29,740 water systems
the national water-system corpus, bucketed by value
Each bar is a band; taller bars hold more water systems. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source EPA SDWIS · 2026-05-15
Health-based violations on Csp-Hidden Valley
0 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for SD4600049.
Sources: EPA SDWIS
Nationwide peers
71 violations · 45 served: nearest cross-state SDWIS matches.
Cross-state systems near this violation count
Nearest cross-state community systems (500+ served) by total SDWIS violations on record.
What to do with Csp-Hidden Valley
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in South Dakota compares on the same EPA violation measures. South Dakota systems
- Check whether PFAS was detected at this system under UCMR5 testing. PFAS guide
- Find and compare another public water system by name or PWSID. Search systems
EPA SDWIS and UCMR5 figures are informational only, not a substitute for a certified lab test of your own tap water.