Is North Liberty Water Supply Tap Water Safe? Quality Report

Water source: Ground water
Ownership: Local government
Counties served: Johnson

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

violations on file

still open

Violation	Type	Status	Period
MCL	Health-based	Archived	1999-01-01 → 1999-01-31
MR	Monitoring	Resolved	2005-01-01 → 2005-03-31
MR	Monitoring	Resolved	2005-01-01 → 2005-03-31
MR	Monitoring	Resolved	2001-06-01 → 2001-06-30
MR	Monitoring	Resolved	2001-06-01 → 2001-06-30
MR	Monitoring	Resolved	2001-06-01 → 2001-06-30
MR	Monitoring	Resolved	2001-06-01 → 2001-06-30
MR	Monitoring	Resolved	2001-06-01 → 2001-06-30
MR	Monitoring	Resolved	2001-06-01 → 2001-06-30
MR	Monitoring	Resolved	2001-05-01 → 2001-05-31

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.

Contaminant	Level vs EPA limit	Detection rate	Source	Period
Copper	778 µg/L 60% of the EPA limit 1300 µg/L worst single sample: 1000 µg/L	173/180	SYR4	2012–2019
Lead	8.7 µg/L 58% of the EPA limit 15 µg/L worst single sample: 34 µg/L	24/180	SYR4	2012–2019
Bromoform	2.57 µg/L No EPA limit set worst single sample: 3.7 µg/L	23/31	SYR4	2012–2019
Dibromochloromethane	2.785 µg/L No EPA limit set worst single sample: 3.5 µg/L	22/31	SYR4	2012–2019
TTHM	6.41 µg/L 8% of the EPA limit 80 µg/L worst single sample: 8.5 µg/L	20/31	SYR4	2012–2019
Bromodichloromethane	1.4 µg/L No EPA limit set	16/31	SYR4	2012–2019
Lead	0.0 mg/L 0% of the EPA limit 0.0150 mg/L	15/15	LCR	2025
Nitrate	1400 µg/L 14% of the EPA limit 10000 µg/L	10/34	SYR4	2012–2019
Dibromoacetic Acid	1 µg/L No EPA limit set	6/31	SYR4	2012–2019
Chloroform	0.9800 µg/L No EPA limit set worst single sample: 1 µg/L	5/31	SYR4	2012–2019
Combined Radium (-226 And -228)	2.06 pCi/L 41% of the EPA limit 5 pCi/L worst single sample: 2.1 pCi/L	3/3	SYR4	2012–2018
Arsenic	4.9 µg/L 49% of the EPA limit 10 µg/L worst single sample: 5 µg/L	2/3	SYR4	2012–2015
Fluoride	1397 µg/L 35% of the EPA limit 4000 µg/L worst single sample: 1400 µg/L	2/2	SYR4	2012–2015
Xylenes, Total	1.455 µg/L 0% of the EPA limit 10000 µg/L worst single sample: 1.5 µg/L	2/5	SYR4	2012–2018
Lithium	78 µg/L No EPA limit set	2/2	UCMR-5	2023

76 contaminants tested, none detected

1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalAtrazineBariumBenzeneBenzo(A)PyreneChlorobenzeneCadmiumCarbon TetrachlorideChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDichloroacetic AcidDinosebDiquatEthylbenzeneGlyphosateHfpo-DaLassoMercuryMonobromoacetic AcidMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitritePfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Haloacetic Acids (HAA5)Trichloroacetic AcidTrichloroethyleneVinyl Chloridecis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: NORTH LIBERTY WATER PLANT
Phone: 319-626-5719
Email: [email protected]

Frequently asked questions about North Liberty Water Supply

Is North Liberty Water Supply tap water safe to drink?

EPA monitoring detected 15 contaminants in North Liberty Water Supply'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 North Liberty Water Supply's water?

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

How many people does North Liberty Water Supply serve?

North Liberty Water Supply reports serving 23,276 people in Iowa, per its EPA record.

Has North Liberty Water Supply had any water quality violations?

The EPA has 32 violations on file for North Liberty Water Supply, of which 1 is 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.