Is Gahanna City Tap Water Safe? Quality Report

Water source: SWP
Ownership: Local government
Counties served: Franklin

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	Resolved	2013-04-01 → 2013-06-30
MCL	Health-based	Resolved	2013-04-01 → 2013-06-30
MCL	Health-based	Resolved	2013-04-01 → 2013-06-30
MCL	Health-based	Resolved	2013-04-01 → 2013-06-30
MCL	Health-based	Resolved	2013-01-01 → 2013-03-31
MCL	Health-based	Resolved	2013-01-01 → 2013-03-31
MCL	Health-based	Resolved	2013-01-01 → 2013-03-31
MCL	Health-based	Resolved	2013-01-01 → 2013-03-31
MCL	Health-based	Resolved	2012-10-01 → 2012-12-31
MCL	Health-based	Resolved	2012-10-01 → 2012-12-31

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
Bromodichloromethane	13.965 µg/L No EPA limit set worst single sample: 19.3 µg/L	128/128	SYR4	2012–2019
Chloroform	70.665 µg/L No EPA limit set worst single sample: 88.6 µg/L	128/128	SYR4	2012–2019
Dichloroacetic Acid	29.465 µg/L No EPA limit set worst single sample: 37 µg/L	128/128	SYR4	2012–2019
TTHM	89.32 µg/L 112% of the EPA limit, at the 95th percentile of samples — 80 µg/L worst single sample: 110 µg/L	128/128	SYR4	2012–2019
Dibromochloromethane	3.4 µg/L No EPA limit set worst single sample: 6.3 µg/L	127/128	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	53.26 µg/L 89% of the EPA limit 60 µg/L worst single sample: 63.4 µg/L	125/128	SYR4	2012–2019
Trichloroacetic Acid	24.24 µg/L No EPA limit set worst single sample: 28.4 µg/L	125/128	SYR4	2012–2019
Monochloroacetic Acid	7.64 µg/L No EPA limit set worst single sample: 13.6 µg/L	117/128	SYR4	2012–2019
Bromoform	2.065 µg/L No EPA limit set worst single sample: 3.1 µg/L	48/128	SYR4	2012–2019
Copper	83.8 µg/L 6.4% of the EPA limit 1300 µg/L worst single sample: 124 µg/L	25/100	SYR4	2012–2018
Lead	0.00050 mg/L 3.3% of the EPA limit 0.0150 mg/L	22/22	LCR	2024
Lead	24.305 µg/L 162% of the EPA limit, at the 95th percentile of samples — 15 µg/L worst single sample: 25.1 µg/L	2/99	SYR4	2012–2018
Dibromoacetic Acid	1.2 µg/L No EPA limit set	1/128	SYR4	2012–2019

31 contaminants tested, none detected

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Utility contact

Contact: JONES, MATTHEW D
Phone: 614-342-4427
Email: [email protected]

Frequently asked questions about Gahanna City

Is Gahanna City tap water safe to drink?

EPA monitoring detected 13 contaminants in Gahanna City'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 Gahanna City's water?

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

How many people does Gahanna City serve?

Gahanna City reports serving 33,258 people in Ohio, per its EPA record.

Has Gahanna City had any water quality violations?

The EPA has 33 violations on file for Gahanna City, of which 12 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.