Community Water System · PWS CT0520011
Ctwc - Unionville System
Operator location Clinton, Connecticut - 30% of 27 violations are health-based (upper-third health share (> 23%)); surface water source; 14,693 served per SDWIS.
- 14,693
- People served (this PWS)
- 27
- EPA violations (this PWS)
- 8
- Health-based (this PWS)
- 6 PFAS
- UCMR5 (this PWS)
Ctwc - Unionville System standing, mid SDWIS violation third
30% of 27 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 30% is upper-third health share (> 23%). UCMR5: upper-third PFAS panel (> 4 compounds). Population rank #3,528 of 29,740 among systems serving 500+.
The verdict
Ctwc - Unionville System lands in the middle third by violation volume (27), large enough for peer comparisons without matching the fleet's heaviest ledgers. Population served is large (14,693; larger served population (> 3,309)), so household exposure scale sits behind the violation mix. Health-based share is 30% - most of this ledger is MCL or treatment-technique exceedance. UCMR5 detected 6 PFAS compounds (upper-third PFAS panel (> 4 compounds)).
- #3,528 of 29,740
- Population · /systems
- #31 of 184
- Population · CT
- 27
- Total EPA violations on record
- 30%
- Health-based (MCL / treatment failure)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
6 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.
System Details
- System Type
- Community
- Owner Type
- Private
- Connections
- 6,319
- County
- Hartford
- School/Daycare
- No
- MCL Violations
- 4
- Monitoring Violations
- 9
- Treatment Tech Violations
- 4
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 7 | 1999 |
| Coliform (TCR) | MCL | 4 | 2002 |
| Groundwater Rule | TT | 4 | 2019 |
| Lead and Copper Rule | MR | 2 | 2016 |
Violation Count vs. the National Corpus
Ctwc - Unionville System has 27 recorded EPA violations, 39% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 60% carry more. 30% of this system's own violations are health-based (8 of 27), and it ranks #3,528 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)
27 Lower than most fewer violations than 60% 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. 12 of 290 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| PFUnA | 9/19/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFOS | 9/19/2023 | 6.00 ppt | 4.00 ppt | Detected |
| PFHxA | 9/19/2023 | 4.00 ppt | 3.00 ppt | Detected |
| PFDoA | 9/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 9/19/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFDA | 9/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFOA | 9/19/2023 | 6.00 ppt | 4.00 ppt | Detected |
| PFNA | 9/19/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHxS | 9/19/2023 | 3.00 ppt | 3.00 ppt | Detected |
| PFHpA | 9/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBS | 9/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| NMeFOSAA | 9/19/2023 | <6.00 ppt | 6.00 ppt | Not Detected |
| NEtFOSAA | 9/19/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFTrDA | 9/19/2023 | <7.00 ppt | 7.00 ppt | Not Detected |
| 9Cl-PF3ONS | 9/19/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFEESA | 9/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| ADONA | 9/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpS | 9/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeS | 9/19/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| NFDHA | 9/19/2023 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFTA | 9/19/2023 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFMBA | 9/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeA | 9/19/2023 | 4.00 ppt | 3.00 ppt | Detected |
| PFMPA | 9/19/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| 8:2 FTS | 9/19/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| 4:2 FTS | 9/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 6:2 FTS | 9/19/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBA | 9/19/2023 | 7.00 ppt | 5.00 ppt | Detected |
| HFPO-DA | 9/19/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFPeA | 9/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| HFPO-DA | 9/19/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBA | 9/19/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| 6:2 FTS | 9/19/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| 4:2 FTS | 9/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBS | 9/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMPA | 9/19/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFMBA | 9/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFEESA | 9/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| NFDHA | 9/19/2023 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFPeS | 9/19/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHpS | 9/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 8:2 FTS | 9/19/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| 9Cl-PF3ONS | 9/19/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFHxS | 9/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFUnA | 9/19/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFDoA | 9/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| NMeFOSAA | 9/19/2023 | <6.00 ppt | 6.00 ppt | Not Detected |
| PFTA | 9/19/2023 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFTrDA | 9/19/2023 | <7.00 ppt | 7.00 ppt | Not Detected |
| NEtFOSAA | 9/19/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
Health-based violations on Ctwc - Unionville System
8 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for CT0520011.
Sources: EPA SDWIS
Nationwide peers
27 violations · 14,693 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.
Cross-state systems with similar served population
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Ctwc - Unionville System
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Connecticut compares on the same EPA violation measures. Connecticut 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.