Community Water System · PWS SD4600230
Oelrichs
Operator location Oelrichs, South Dakota - 41% of 99 violations are health-based (upper-third health share (> 23%)); groundwater source; 117 served per SDWIS.
- 117
- People served (this PWS)
- 99
- EPA violations (this PWS)
- 41
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Oelrichs standing, high SDWIS violation third
41% of 99 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 41% is upper-third health share (> 23%).
The verdict
Oelrichs sits in the upper third of the sitemap cohort by violation count (99), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (117; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 41% - most of this ledger is MCL or treatment-technique exceedance. No UCMR5 PFAS test appears for this system in this extract.
- 99
- Total EPA violations on record
- 41%
- Health-based (MCL / treatment failure)
- 117
- 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
- Community
- Owner Type
- Local
- Connections
- 75
- County
- Fall River
- School/Daycare
- No
- MCL Violations
- 39
- Monitoring Violations
- 47
- Treatment Tech Violations
- 2
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Nitrate | MCL | 35 | 2001 |
| Coliform (TCR) | MR | 24 | 2014 |
| Chlorine | MR | 18 | 2021 |
| Coliform (TCR) | MCL | 4 | 2014 |
| Public Notice | Other | 4 | 2014 |
| Revised Total Coliform Rule | MON | 3 | 2021 |
| Stage 1 Disinfectants and Disinfection Byproducts Rule | TT | 2 | 2014 |
| Gross Alpha, Excl. Radon and U | MR | 1 | 1976 |
| Combined Radium (-226 and -228) | MR | 1 | 1976 |
Violation Count vs. the National Corpus
Oelrichs has 99 recorded EPA violations, 73% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 27% carry more. 41% of this system's own violations are health-based (41 of 99), 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)
99 Around the middle fewer violations than 27% 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 Oelrichs
41 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for SD4600230.
Sources: EPA SDWIS
Nationwide peers
99 violations · 117 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.
What to do with Oelrichs
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.