Is Castle Airport Tap Water Safe? Quality Report

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

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
TT	Health-based	Unaddressed	2024-10-17
MCL	Health-based	Resolved	1994-01-01 → 1994-01-31
MCL	Health-based	Resolved	1993-03-01 → 1993-04-30
MCL	Health-based	Resolved	1993-03-01 → 1993-04-30
RPT	Monitoring	Unaddressed	2024-10-17
MON	Monitoring	Resolved	2021-10-01 → 2021-10-31
MON	Monitoring	Resolved	2021-10-01 → 2021-10-31
MR	Monitoring	Resolved	2021-01-01 → 2021-12-31
MR	Monitoring	Resolved	2021-01-01 → 2021-12-31
MR	Monitoring	Resolved	2021-01-01 → 2021-12-31

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
Nitrate	4314.1 µg/L 43% of the EPA limit 10000 µg/L worst single sample: 4836.4 µg/L	36/36	SYR4	2013–2019
Lead	0.0069 mg/L 46% of the EPA limit 0.0150 mg/L	8/8	LCR	2023
Arsenic	5.2175 µg/L 52% of the EPA limit 10 µg/L worst single sample: 5.29 µg/L	6/6	SYR4	2013–2019
Fluoride	280 µg/L 7% of the EPA limit 4000 µg/L	6/6	SYR4	2013–2019
Trichloroethylene	1.056 µg/L 21% of the EPA limit 5 µg/L worst single sample: 1.1 µg/L	5/13	SYR4	2013–2019
Barium	151.6 µg/L 7.6% of the EPA limit 2000 µg/L worst single sample: 152 µg/L	3/6	SYR4	2013–2019
TTHM	2.726 µg/L 3.4% of the EPA limit 80 µg/L worst single sample: 2.84 µg/L	3/10	SYR4	2013–2019
Nitrate-Nitrite	4016.5 µg/L 40% of the EPA limit 10000 µg/L worst single sample: 4140 µg/L	2/2	SYR4	2016
Copper	181 µg/L 14% of the EPA limit 1300 µg/L	1/6	SYR4	2013–2019
Dibromochloromethane	1.06 µg/L No EPA limit set	1/10	SYR4	2013–2019

53 contaminants tested, none detected

1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-DichloropropaneAntimony, TotalAtrazineBhc-GammaBenzeneBeryllium, TotalBromodichloromethaneBromoformChlorobenzeneCyanideCadmiumCarbon TetrachlorideChlordaneChloroformChromiumDichloromethaneDibromoacetic AcidDichloroacetic AcidEthylene DibromideEndrinEthylbenzeneHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoLeadMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNitriteSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Haloacetic Acids (HAA5)ToxapheneTrichloroacetic AcidVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: SPADE, TAMRA
Phone: 209-385-7686
Email: [email protected]

Frequently asked questions about Castle Airport

Is Castle Airport tap water safe to drink?

EPA monitoring detected 10 contaminants in Castle Airport'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 Castle Airport's water?

EPA monitoring detected Nitrate, Lead, Arsenic, Fluoride, Trichloroethylene, and others. The full list with the level and data source for each is above.

How many people does Castle Airport serve?

Castle Airport reports serving 1,650 people in California, per its EPA record.

Has Castle Airport had any water quality violations?

The EPA has 14 violations on file for Castle Airport, of which 4 are health-based (a contaminant limit or required treatment was breached) and 2 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.