Is Ctwc - Shoreline Region-Guilford Tap Water Safe? Quality Report

Water source: Surface water
Ownership: Private
Counties served: New Haven

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.

health-based violations

574

violations on file

still open

Violation	Type	Status	Period
MR	Monitoring	Resolved	2015-04-01 → 2015-06-30
MR	Monitoring	Resolved	2015-04-01 → 2015-06-30
MR	Monitoring	Resolved	2015-04-01 → 2015-06-30
MR	Monitoring	Resolved	2015-04-01 → 2015-06-30
MR	Monitoring	Resolved	2008-07-01 → 2008-09-30
MR	Monitoring	Resolved	2008-07-01 → 2008-09-30
MR	Monitoring	Resolved	2008-07-01 → 2008-09-30
MR	Monitoring	Resolved	2008-07-01 → 2008-09-30
MR	Monitoring	Resolved	2008-07-01 → 2008-09-30
MR	Monitoring	Resolved	2008-07-01 → 2008-09-30

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).

Contaminant	Max	Detection rate	Period
PFOA	0.0060 µg/L	8/22	2025
PFOS	0.0120 µg/L	6/22	2025
Pfba	0.0120 µg/L	3/22	2025
PFBS	0.0050 µg/L	3/22	2025
Pfpea	0.0040 µg/L	3/22	2025
Pfhxa	0.0040 µg/L	2/22	2025
PFHXS	0.0040 µg/L	1/22	2025

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.

Contaminant	Level vs EPA limit	Detection rate	Source	Period
Nitrate	2782 µg/L 28% of the EPA limit 10000 µg/L worst single sample: 3369 µg/L	230/260	SYR4	2012–2019
Chloroform	35 µg/L No EPA limit set worst single sample: 50 µg/L	181/227	SYR4	2012–2019
Bromodichloromethane	11.08 µg/L No EPA limit set worst single sample: 15.3 µg/L	177/227	SYR4	2012–2019
Dibromochloromethane	3.2 µg/L No EPA limit set worst single sample: 9 µg/L	173/227	SYR4	2012–2019
TTHM	51.795 µg/L 65% of the EPA limit 80 µg/L worst single sample: 65.2 µg/L	138/141	SYR4	2012–2019
Dichloroacetic Acid	13.25 µg/L No EPA limit set worst single sample: 17 µg/L	136/136	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	29.25 µg/L 49% of the EPA limit 60 µg/L worst single sample: 37 µg/L	136/136	SYR4	2012–2019
Trichloroacetic Acid	16 µg/L No EPA limit set worst single sample: 21 µg/L	134/136	SYR4	2012–2019
Nitrate-Nitrite	2755 µg/L 28% of the EPA limit 10000 µg/L worst single sample: 3369 µg/L	123/137	SYR4	2012–2019
Copper	325.55 µg/L 25% of the EPA limit 1300 µg/L worst single sample: 465 µg/L	118/123	SYR4	2012–2019
Fluoride	1037 µg/L 26% of the EPA limit 4000 µg/L worst single sample: 1120 µg/L	39/47	SYR4	2012–2019
Lead	0.0 mg/L 0% of the EPA limit 0.0150 mg/L	39/39	LCR	2026
Lead	4.54 µg/L 30% of the EPA limit 15 µg/L worst single sample: 42.5 µg/L	23/123	SYR4	2012–2019
Barium	21.95 µg/L 1.1% of the EPA limit 2000 µg/L worst single sample: 25 µg/L	22/34	SYR4	2012–2019
Dibromoacetic Acid	2.3 µg/L No EPA limit set worst single sample: 3 µg/L	15/136	SYR4	2012–2019
Monochloroacetic Acid	3.08 µg/L No EPA limit set worst single sample: 3.2 µg/L	4/136	SYR4	2012–2019
Nitrite	5.85 µg/L 0.6% of the EPA limit 1000 µg/L worst single sample: 6 µg/L	4/130	SYR4	2012–2019
Combined Radium (-226 And -228)	2.614 pCi/L 52% of the EPA limit 5 pCi/L worst single sample: 2.76 pCi/L	3/18	SYR4	2014–2019
Bromoform	0.6235 µg/L No EPA limit set worst single sample: 0.6300 µg/L	2/227	SYR4	2012–2019
Arsenic	0.7000 µg/L 7% of the EPA limit 10 µg/L	1/35	SYR4	2012–2019
Beryllium, Total	0.4000 µg/L 10% of the EPA limit 4 µg/L	1/26	SYR4	2012–2019
Combined Uranium	1.05 µg/L 3.5% of the EPA limit 30 µg/L	1/26	SYR4	2014–2019
Di(2-ethylhexyl) Phthalate	2 µg/L 33% of the EPA limit 6 µg/L	1/51	SYR4	2012–2019
Gross Alpha, Excl. Radon And U	2.1 pCi/L 14% of the EPA limit 15 pCi/L	1/18	SYR4	2014–2019

79 contaminants tested, none detected

1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalAtrazineBhc-GammaBenzeneBenzo(A)PyreneChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDinosebDiquatEthylene DibromideEndrinEthylbenzeneGlyphosateGross Beta Particle ActivityHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidNetfosaaNfdhaNmefosaaOxamylPfdaPfdoaPfeesaPfhpaPfhpsPfmbaPfmpaPFNAPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl Chloridecis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: MCDERMOTT, GERALD
Phone: 860-664-6125
Email: [email protected]

Frequently asked questions about Ctwc - Shoreline Region-Guilford

Is Ctwc - Shoreline Region-Guilford tap water safe to drink?

EPA monitoring detected 31 contaminants in Ctwc - Shoreline Region-Guilford'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 Ctwc - Shoreline Region-Guilford's water?

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

How many people does Ctwc - Shoreline Region-Guilford serve?

Ctwc - Shoreline Region-Guilford reports serving 33,975 people in Connecticut, per its EPA record.

Has Ctwc - Shoreline Region-Guilford had any water quality violations?

The EPA has 574 violations on file for Ctwc - Shoreline Region-Guilford, of which 0 are health-based (a contaminant limit or required treatment was breached) and 0 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.