Tap WaterIndex

← Connecticut

Tap water quality report

Aquarion-Ridgefield Knolls

EPA monitoring tested this supplier for 79 contaminants and detected 19. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

79
contaminants tested
19
detected
958
people served
55
health-based violations
Connecticut rankingsLead in ConnecticutPFAS in Connecticut
Water source
Ground water
Ownership
Private
Counties served
Fairfield

Compliance record

Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.

55
health-based violations
222
violations on file
1
still open
ViolationTypeStatusPeriod
TT Health-based Resolved 2008-07-01
TT Health-based Resolved 2008-07-01
TT Health-based Resolved 2008-03-01
TT Health-based Resolved 2005-01-01
TT Health-based Resolved 2005-01-01
MCL Health-based Resolved 2003-11-01 → 2003-11-30
MCL Health-based Resolved 2003-11-01 → 2003-11-30
MCL Health-based Resolved 2003-11-01 → 2003-11-30
MCL Health-based Resolved 2003-11-01 → 2003-11-30
MCL Health-based Resolved 2003-07-01 → 2003-07-31

Other contaminants detected

Each bar shows the measured level as a share of the EPA limit: green is well under, amber is close to it, red is over. For lead and copper the limit applies to exactly the 90th-percentile figure shown, so red there means a real exceedance. For everything else the limit applies to a running annual average while the figure is the 95th percentile of this system's samples — over 100% is worth reading, but is not by itself a violation. Where a single sample came in higher than that percentile, it is noted under the bar. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Copper
779 µg/L 60%
of the EPA limit 1300 µg/L
worst single sample: 1250 µg/L
34/34 SYR4 2012–2018
Lead
0.0030 mg/L 20%
of the EPA limit 0.0150 mg/L
 24/24 LCR 2024
Dibromochloromethane
11.3 µg/L
No EPA limit set
worst single sample: 13 µg/L
18/22 SYR4 2012–2019
Bromodichloromethane
12.6 µg/L
No EPA limit set
worst single sample: 15 µg/L
17/22 SYR4 2012–2019
Nitrate
1491 µg/L 15%
of the EPA limit 10000 µg/L
 16/16 SYR4 2012–2019
Chloroform
11.9 µg/L
No EPA limit set
worst single sample: 14 µg/L
15/22 SYR4 2012–2019
Bromoform
3 µg/L
No EPA limit set
 14/22 SYR4 2012–2019
Dibromoacetic Acid
3 µg/L
No EPA limit set
 14/14 SYR4 2012–2019
Dichloroacetic Acid
5.35 µg/L
No EPA limit set
worst single sample: 6 µg/L
14/14 SYR4 2012–2019
TTHM
37.1 µg/L 46%
of the EPA limit 80 µg/L
worst single sample: 41 µg/L
14/14 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
9.35 µg/L 16%
of the EPA limit 60 µg/L
worst single sample: 10 µg/L
14/14 SYR4 2012–2019
Lead
10.15 µg/L 68%
of the EPA limit 15 µg/L
worst single sample: 14 µg/L
12/34 SYR4 2012–2018
Trichloroacetic Acid
1.5 µg/L
No EPA limit set
worst single sample: 2 µg/L
11/14 SYR4 2012–2019
Nitrate-Nitrite
1402.1 µg/L 14%
of the EPA limit 10000 µg/L
worst single sample: 1491 µg/L
8/8 SYR4 2012–2019
Barium
57.6 µg/L 2.9%
of the EPA limit 2000 µg/L
worst single sample: 58 µg/L
2/2 SYR4 2014–2018
Combined Uranium
1.495 µg/L 5%
of the EPA limit 30 µg/L
worst single sample: 1.5 µg/L
2/2 SYR4 2016–2019
Fluoride
40 µg/L 1%
of the EPA limit 4000 µg/L
 2/2 SYR4 2014–2018
Gross Alpha, Excl. Radon And U
4.8 pCi/L 32%
of the EPA limit 15 pCi/L
 1/2 SYR4 2016–2019
Monochloroacetic Acid
1 µg/L
No EPA limit set
 1/14 SYR4 2012–2019
60 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane2,4,5-TP2,4-DAntimony, TotalArsenicAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumCombined Radium (-226 And -228)DichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndrinEthylbenzeneGlyphosateHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidNitriteOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl Chloridecis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
ULRICH, ROBERT J.
Phone
203-926-4320
Email
[email protected]

Frequently asked questions about Aquarion-Ridgefield Knolls

Is Aquarion-Ridgefield Knolls tap water safe to drink?

EPA monitoring detected 19 contaminants in Aquarion-Ridgefield Knolls's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.

What contaminants were detected in Aquarion-Ridgefield Knolls's water?

EPA monitoring detected Copper, Lead, Dibromochloromethane, Bromodichloromethane, Nitrate, and others. The full list with the level and data source for each is above.

How many people does Aquarion-Ridgefield Knolls serve?

Aquarion-Ridgefield Knolls reports serving 958 people in Connecticut, per its EPA record.

Has Aquarion-Ridgefield Knolls had any water quality violations?

The EPA has 222 violations on file for Aquarion-Ridgefield Knolls, of which 55 are health-based (a contaminant limit or required treatment was breached) and 1 remain open. The rest are monitoring or reporting failures.

Where does this data come from?

Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.