Community Water System · PWS NC0351185
Southgate S/D
Operator location Cary, North Carolina - 73% of 56 violations are health-based (upper-third health share (> 23%)); surface water source; 160 served per SDWIS.
- 160
- People served (this PWS) Smaller third of systems
- 56
- EPA violations (this PWS) Middle third of systems
- 41
- Health-based (this PWS) Upper third by health-based share
- 6 PFAS
- UCMR5 (this PWS) Upper third of PFAS-detected systems
Southgate S/D standing, mid SDWIS violation third
73% of 56 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 73% is upper-third health share (> 23%). UCMR5: upper-third PFAS panel (> 4 compounds).
The verdict
Southgate S/D lands in the middle third by violation volume (56), large enough for peer comparisons without matching the fleet's heaviest ledgers. Population served is smaller (160; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 73% - most of this ledger is MCL or treatment-technique exceedance. UCMR5 detected 6 PFAS compounds (upper-third PFAS panel (> 4 compounds)).
- 56
- Total EPA violations on record
- 73%
- Health-based (MCL / treatment failure)
- 160
- People served by this PWS (SDWIS)
- 6
- PFAS compounds detected (UCMR5)
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.
Based on EPA SDWIS violation history and UCMR5 PFAS testing only, not water taste, odor, infrastructure age, or contaminants outside the federally tracked set.
System Details
- System Type
- Community
- Owner Type
- Private
- Connections
- 63
- County
- Johnston
- School/Daycare
- No
- MCL Violations
- 41
- Monitoring Violations
- 0
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Combined Radium (-226 and -228) | MCL | 41 | 2008 |
| Public Notice | Other | 7 | 2009 |
| Revised Total Coliform Rule | RPT | 5 | 2023 |
| Consumer Confidence Rule | Other | 3 | 2002 |
Violation Count vs. the National Corpus
Southgate S/D has 56 recorded EPA violations, 60% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 40% carry more. 73% of this system's own violations are health-based (41 of 56), 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)
56 Around the middle fewer violations than 40% 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
How many violations vs. how serious, among peer systems
Southgate S/D plotted against 29 peer public water systems (500+ people served), by total violation count (x) and the share of those violations that are health-based (y). The crosshair sits at this sample's own median on each axis. A high violation count does not automatically mean a serious record: most monitoring and reporting violations are minor, not health-based.
Violation volume vs. health-based share
PFAS Testing Results (UCMR5)
Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 18 of 87 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| PFNA | 9/15/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| 9Cl-PF3ONS | 9/15/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| ADONA | 9/15/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| HFPO-DA | 9/15/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBA | 9/15/2025 | 5.70 ppt | 5.00 ppt | Detected |
| 6:2 FTS | 9/15/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| 4:2 FTS | 9/15/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| 8:2 FTS | 9/15/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFHxS | 9/15/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpA | 9/15/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMPA | 9/15/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOS | 9/15/2025 | 7.70 ppt | 4.00 ppt | Detected |
| PFOA | 9/15/2025 | 7.60 ppt | 4.00 ppt | Detected |
| PFDA | 9/15/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDoA | 9/15/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBS | 9/15/2025 | 4.70 ppt | 3.00 ppt | Detected |
| PFUnA | 9/15/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 9/15/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| NEtFOSAA | 9/15/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFHxA | 9/15/2025 | 6.80 ppt | 3.00 ppt | Detected |
| PFPeA | 9/15/2025 | 6.80 ppt | 3.00 ppt | Detected |
| NMeFOSAA | 9/15/2025 | <6.00 ppt | 6.00 ppt | Not Detected |
| PFTrDA | 9/15/2025 | <7.00 ppt | 7.00 ppt | Not Detected |
| PFTA | 9/15/2025 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFHpS | 9/15/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| NFDHA | 9/15/2025 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFEESA | 9/15/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMBA | 9/15/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeS | 9/15/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| NEtFOSAA | 6/11/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFTA | 6/11/2025 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFTrDA | 6/11/2025 | <7.00 ppt | 7.00 ppt | Not Detected |
| PFHxA | 6/11/2025 | 4.80 ppt | 3.00 ppt | Detected |
| PFPeS | 6/11/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHpS | 6/11/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFNA | 6/11/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHxS | 6/11/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpA | 6/11/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDA | 6/11/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBS | 6/11/2025 | 3.90 ppt | 3.00 ppt | Detected |
| NMeFOSAA | 6/11/2025 | <6.00 ppt | 6.00 ppt | Not Detected |
| NFDHA | 6/11/2025 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFEESA | 6/11/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMBA | 6/11/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeA | 6/11/2025 | 4.10 ppt | 3.00 ppt | Detected |
| PFMPA | 6/11/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| 8:2 FTS | 6/11/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| 6:2 FTS | 6/11/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBA | 6/11/2025 | 5.50 ppt | 5.00 ppt | Detected |
| HFPO-DA | 6/11/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
Health-based violations on Southgate S/D
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 NC0351185.
Sources: EPA SDWIS · North Carolina DEQ, Public Water Supply Section
Nationwide peers
56 violations · 160 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.
What to do with Southgate S/D
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.
Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.