Community Water System · PWS SD4600119
Estelline
Operator location Estelline, South Dakota - 33% of 205 violations are health-based (upper-third health share (> 23%)); groundwater source; 749 served per SDWIS.
- 749
- People served (this PWS)
- 205
- EPA violations (this PWS)
- 67
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Estelline standing, high SDWIS violation third
33% of 205 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 33% is upper-third health share (> 23%). Population rank #23,560 of 29,740 among systems serving 500+.
The verdict
Estelline sits in the upper third of the sitemap cohort by violation count (205), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (749; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 33% - most of this ledger is MCL or treatment-technique exceedance. No UCMR5 PFAS test appears for this system in this extract.
- #23,560 of 29,740
- Population · /systems
- #132 of 171
- Population · SD
- 205
- Total EPA violations on record
- 33%
- Health-based (MCL / treatment failure)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 325
- County
- Hamlin
- School/Daycare
- No
- MCL Violations
- 65
- Monitoring Violations
- 109
- Treatment Tech Violations
- 2
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MCL | 33 | 2005 |
| Nitrate | MCL | 32 | 2007 |
| Nitrate | MR | 15 | 2019 |
| Coliform (TCR) | MR | 11 | 2005 |
| Aldicarb | MR | 3 | 1999 |
| Aldicarb sulfone | MR | 3 | 1999 |
| Dalapon | MR | 3 | 1999 |
| Dinoseb | MR | 3 | 1999 |
| 2,4,5-TP | MR | 3 | 1999 |
| Pentachlorophenol | MR | 3 | 1999 |
| Coliform (TCR) | Other | 3 | 1997 |
| Picloram | MR | 3 | 1999 |
| Glyphosate | MR | 3 | 1999 |
| Aldicarb sulfoxide | MR | 3 | 1999 |
| Carbofuran | MR | 3 | 1999 |
| 2,4-D | MR | 3 | 1999 |
| OXAMYL | MR | 3 | 1999 |
| Lead and Copper Rule | MR | 3 | 1993 |
| Stage 1 Disinfectants and Disinfection Byproducts Rule | TT | 2 | 2023 |
| Vinyl chloride | MR | 2 | 1999 |
| 1,1,1-Trichloroethane | MR | 2 | 1999 |
| Ethylbenzene | MR | 2 | 1999 |
| Xylenes, Total | MR | 2 | 1999 |
| CHLOROBENZENE | MR | 2 | 1999 |
| trans-1,2-Dichloroethylene | MR | 2 | 1999 |
| 1,2-Dichloropropane | MR | 2 | 1999 |
| p-Dichlorobenzene | MR | 2 | 1999 |
| Trichloroethylene | MR | 2 | 1999 |
| Styrene | MR | 2 | 1999 |
| 1,2-Dichloroethane | MR | 2 | 1999 |
Violation Count vs. the National Corpus
Estelline has 205 recorded EPA violations, 86% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 14% carry more. 33% of this system's own violations are health-based (67 of 205), and it ranks #23,560 of 29,740 by population served among that same cohort.
EPA violations vs. the national water-system corpus
Public water systems serving 500+ people (EPA SDWIS)
205 Higher than most more violations than 86% 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 Estelline
67 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for SD4600119.
Sources: EPA SDWIS
Nationwide peers
205 violations · 749 served: nearest cross-state SDWIS matches.
Cross-state systems with comparable violation load
Nearest cross-state community systems (500+ served) by total SDWIS violations on record.
Cross-state systems with smaller service footprints
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Estelline
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.