Community Water System · PWS CT0910081
Knollcrest Tax District
Operator location New Fairfield, Connecticut - smaller served population (≤ 999) at 356 people served; 163 SDWIS violations on record from groundwater sources.
- 356
- People served (this PWS)
- 163
- EPA violations (this PWS)
- 17
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Knollcrest Tax District standing, high SDWIS violation third
356 people served (SDWIS) - smaller served population (≤ 999). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 10% is middle-third health share (≤ 23%).
The verdict
Knollcrest Tax District sits in the upper third of the sitemap cohort by violation count (163), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (356; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 10% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- 163
- Total EPA violations on record
- 10%
- Health-based (MCL / treatment failure)
- 356
- 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
- 89
- County
- Fairfield
- School/Daycare
- No
- MCL Violations
- 12
- Monitoring Violations
- 116
- Treatment Tech Violations
- 5
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Consumer Confidence Rule | Other | 18 | 2025 |
| Combined Uranium | MR | 14 | 2017 |
| Combined Radium (-226 and -228) | MR | 14 | 2017 |
| Gross Alpha, Excl. Radon and U | MR | 14 | 2017 |
| Coliform (TCR) | MCL | 8 | 1997 |
| Revised Total Coliform Rule | MON | 8 | 2023 |
| Public Notice | Other | 8 | 2025 |
| Revised Total Coliform Rule | MCL | 4 | 2023 |
| Revised Total Coliform Rule | TT | 4 | 2023 |
| Lead and Copper Rule | MR | 4 | 2023 |
| Revised Total Coliform Rule | RPT | 4 | 2016 |
| BHC-GAMMA | MR | 2 | 2017 |
| Methoxychlor | MR | 2 | 2017 |
| Toxaphene | MR | 2 | 2017 |
| Dalapon | MR | 2 | 2017 |
| Diquat | MR | 2 | 2017 |
| Di(2-ethylhexyl) adipate | MR | 2 | 2017 |
| OXAMYL | MR | 2 | 2017 |
| Simazine | MR | 2 | 2017 |
| Di(2-ethylhexyl) phthalate | MR | 2 | 2017 |
| Picloram | MR | 2 | 2017 |
| Aldicarb sulfone | MR | 2 | 2017 |
| Carbofuran | MR | 2 | 2017 |
| Heptachlor | MR | 2 | 2017 |
| 2,4,5-TP | MR | 2 | 2017 |
| Pentachlorophenol | MR | 2 | 2017 |
| Benzo(a)pyrene | MR | 2 | 2017 |
| Total Polychlorinated Biphenyls (PCB) | MR | 2 | 2017 |
| 1,2-DIBROMO-3-CHLOROPROPANE | MR | 2 | 2017 |
| ETHYLENE DIBROMIDE | MR | 2 | 2017 |
Violation Count vs. the National Corpus
Knollcrest Tax District has 163 recorded EPA violations, 82% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 18% carry more. 10% of this system's own violations are health-based (17 of 163), 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)
163 Higher than most more violations than 82% 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
Population served record for Knollcrest Tax District
EPA SDWIS lists 356 people served and 89 connections for this PWS, confirm the service-area footprint on the federal report before comparing to municipal census totals.
Sources: EPA SDWIS
Nationwide peers
163 violations · 356 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 Knollcrest Tax District
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.