Community Water System · PWS MS0410033
Old Union Water System
Operator location Shannon, Mississippi - larger served population (> 3,309) at 3,749 people served; 787 SDWIS violations on record from groundwater sources.
- 3,749
- People served (this PWS)
- 787
- EPA violations (this PWS)
- 18
- Health-based (this PWS)
- No PFAS
- UCMR5 (this PWS)
Old Union Water System standing, high SDWIS violation third
3,749 people served (SDWIS) - larger served population (> 3,309). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 2% is middle-third health share (≤ 23%). UCMR5: UCMR5 tested, none detected. Population rank #9,238 of 29,740 among systems serving 500+.
The verdict
Old Union Water System sits in the upper third of the sitemap cohort by violation count (787), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is large (3,749; larger served population (> 3,309)), so household exposure scale sits behind the violation mix. Health-based share is 2% (middle-third health share (≤ 23%)). UCMR5 tested this system and reported no PFAS above the minimum reporting level.
- #9,238 of 29,740
- Population · /systems
- #181 of 837
- Population · MS
- 787
- Total EPA violations on record
- 2%
- 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
- Public/Private
- Connections
- 1,420
- County
- Lee
- School/Daycare
- No
- MCL Violations
- 18
- Monitoring Violations
- 750
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Combined Uranium | MR | 216 | 2011 |
| Radium-228 | MR | 168 | 2012 |
| Radium-226 | MR | 148 | 2012 |
| Gross Alpha, Excl. Radon and U | MR | 84 | 2008 |
| Combined Radium (-226 and -228) | MR | 84 | 2008 |
| Coliform (TCR) | MCL | 18 | 2011 |
| Consumer Confidence Rule | Other | 14 | 2020 |
| Nitrate | MR | 11 | 2023 |
| Nitrite | MR | 11 | 2023 |
| Nitrate-Nitrite | MR | 11 | 2023 |
| Chlorine | MR | 6 | 2005 |
| Lead and Copper Rule | MR | 4 | 2022 |
| Coliform (TCR) | MR | 3 | 1995 |
| Public Notice | Other | 3 | 2025 |
| TTHM | MR | 2 | 2024 |
| Total Haloacetic Acids (HAA5) | MR | 2 | 2024 |
Violation Count vs. the National Corpus
Old Union Water System has 787 recorded EPA violations, 98% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 2% carry more. 2% of this system's own violations are health-based (18 of 787), and it ranks #9,238 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)
787 Higher than most more violations than 98% 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
PFAS Testing Results (UCMR5)
Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 99 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| NMeFOSAA | 6/3/2025 | <6.00 ppt | 6.00 ppt | Not Detected |
| PFTA | 6/3/2025 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFTrDA | 6/3/2025 | <7.00 ppt | 7.00 ppt | Not Detected |
| NEtFOSAA | 6/3/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFTA | 4/15/2025 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFTrDA | 4/15/2025 | <7.00 ppt | 7.00 ppt | Not Detected |
| NMeFOSAA | 4/15/2025 | <6.00 ppt | 6.00 ppt | Not Detected |
| NEtFOSAA | 4/15/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFTA | 4/15/2025 | <8.00 ppt | 8.00 ppt | Not Detected |
| NMeFOSAA | 4/15/2025 | <6.00 ppt | 6.00 ppt | Not Detected |
| NEtFOSAA | 4/15/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFTrDA | 4/15/2025 | <7.00 ppt | 7.00 ppt | Not Detected |
| 6:2 FTS | 10/15/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| 4:2 FTS | 10/15/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| 8:2 FTS | 10/15/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFEESA | 10/15/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| NFDHA | 10/15/2025 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFBA | 10/15/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFHpS | 10/15/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| 9Cl-PF3ONS | 10/15/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| NMeFOSAA | 10/15/2025 | <6.00 ppt | 6.00 ppt | Not Detected |
| NEtFOSAA | 10/15/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFTrDA | 10/15/2025 | <7.00 ppt | 7.00 ppt | Not Detected |
| PFTA | 10/15/2025 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFPeS | 10/15/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFDoA | 10/15/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxS | 10/15/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFNA | 10/15/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFMBA | 10/15/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| HFPO-DA | 10/15/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFPeA | 10/15/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpA | 10/15/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDA | 10/15/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFOS | 10/15/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHxA | 10/15/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFUnA | 10/15/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFMPA | 10/15/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 10/15/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBS | 10/15/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| ADONA | 10/15/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFOA | 10/15/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFDoA | 10/15/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| 6:2 FTS | 10/15/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| 4:2 FTS | 10/15/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| 8:2 FTS | 10/15/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFMPA | 10/15/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFPeA | 10/15/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMBA | 10/15/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFEESA | 10/15/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| NFDHA | 10/15/2025 | <20.00 ppt | 20.00 ppt | Not Detected |
Population served record for Old Union Water System
EPA SDWIS lists 3,749 people served and 1,420 connections for this PWS, confirm the service-area footprint on the federal report before comparing to municipal census totals.
Sources: EPA SDWIS
Nationwide peers
787 violations · 3,749 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 similar served population
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Old Union Water System
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Mississippi compares on the same EPA violation measures. Mississippi 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.