Community Water System · PWS NC0392020
Cary, Town Of
Operator location Cary, North Carolina - larger served population (> 3,309) at 224,000 people served; 69 SDWIS violations on record from surface water sources.
- 224,000
- People served (this PWS)
- 69
- EPA violations (this PWS)
- 15
- Health-based (this PWS)
- 4 PFAS
- UCMR5 (this PWS)
Cary, Town Of standing, mid SDWIS violation third
224,000 people served (SDWIS) - larger served population (> 3,309). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 22% is middle-third health share (≤ 23%). UCMR5: middle-third PFAS panel (≤ 4 compounds). Population rank #176 of 29,740 among systems serving 500+.
The verdict
Cary, Town Of lands in the middle third by violation volume (69), large enough for peer comparisons without matching the fleet's heaviest ledgers. Population served is large (224,000; larger served population (> 3,309)), so household exposure scale sits behind the violation mix. Health-based share is 22% (middle-third health share (≤ 23%)). UCMR5 detected 4 PFAS compounds (middle-third PFAS panel (≤ 4 compounds)).
- #176 of 29,740
- Population · /systems
- #6 of 713
- Population · NC
- 69
- Total EPA violations on record
- 22%
- Health-based (MCL / treatment failure)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
4 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 60,391
- County
- Wake
- School/Daycare
- No
- MCL Violations
- 15
- Monitoring Violations
- 32
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 19 | 2014 |
| Chloramine | MR | 10 | 2014 |
| Revised Total Coliform Rule | MCL | 8 | 2023 |
| Coliform (TCR) | MCL | 7 | 2006 |
| Public Notice | Other | 7 | 2023 |
| Consumer Confidence Rule | Other | 4 | 2001 |
| Asbestos | MR | 3 | 2002 |
Violation Count vs. the National Corpus
Cary, Town Of has 69 recorded EPA violations, 65% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 35% carry more. 22% of this system's own violations are health-based (15 of 69), and it ranks #176 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)
69 Around the middle fewer violations than 35% 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. 13 of 116 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| NEtFOSAA | 8/5/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFMBA | 8/5/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| NFDHA | 8/5/2025 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFHpS | 8/5/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFTrDA | 8/5/2025 | <7.00 ppt | 7.00 ppt | Not Detected |
| NMeFOSAA | 8/5/2025 | <6.00 ppt | 6.00 ppt | Not Detected |
| PFEESA | 8/5/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFTA | 8/5/2025 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFHxA | 8/5/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBS | 8/5/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeA | 8/5/2025 | 4.30 ppt | 3.00 ppt | Detected |
| PFHpA | 8/5/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeS | 8/5/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHxS | 8/5/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFNA | 8/5/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOS | 8/5/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOA | 8/5/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFDoA | 8/5/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFUnA | 8/5/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 8/5/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| 9Cl-PF3ONS | 8/5/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| ADONA | 8/5/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| HFPO-DA | 8/5/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBA | 8/5/2025 | 5.70 ppt | 5.00 ppt | Detected |
| PFMPA | 8/5/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| 8:2 FTS | 8/5/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| 6:2 FTS | 8/5/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| 4:2 FTS | 8/5/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDA | 8/5/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFTA | 5/6/2025 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFTrDA | 5/6/2025 | <7.00 ppt | 7.00 ppt | Not Detected |
| NEtFOSAA | 5/6/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| NMeFOSAA | 5/6/2025 | <6.00 ppt | 6.00 ppt | Not Detected |
| 9Cl-PF3ONS | 5/6/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| 6:2 FTS | 5/6/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBA | 5/6/2025 | 7.30 ppt | 5.00 ppt | Detected |
| HFPO-DA | 5/6/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFMBA | 5/6/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxS | 5/6/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpA | 5/6/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBS | 5/6/2025 | 3.40 ppt | 3.00 ppt | Detected |
| NFDHA | 5/6/2025 | <20.00 ppt | 20.00 ppt | Not Detected |
| 8:2 FTS | 5/6/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFHpS | 5/6/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| 4:2 FTS | 5/6/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| ADONA | 5/6/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 5/6/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFUnA | 5/6/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFHxA | 5/6/2025 | 6.60 ppt | 3.00 ppt | Detected |
| PFDoA | 5/6/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
Population served record for Cary, Town Of
EPA SDWIS lists 224,000 people served and 60,391 connections for this PWS, confirm the service-area footprint on the federal report before comparing to municipal census totals.
Sources: EPA SDWIS · North Carolina DEQ, Public Water Supply Section
Nationwide peers
69 violations · 224,000 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 Cary, Town Of
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in North Carolina compares on the same EPA violation measures. North Carolina 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.