Is Signal Hill - City, Water Dept. Tap Water Safe? Quality Report

Water source: SWP
Ownership: Local government
Counties served: Los Angeles

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	Resolved	2025-04-01 → 2025-04-30
TT	Health-based	Resolved	2025-04-01 → 2025-04-30
TT	Health-based	Resolved	2025-03-01 → 2025-03-31
TT	Health-based	Resolved	2025-03-01 → 2025-03-31
TT	Health-based	Resolved	2025-02-01 → 2025-02-28
TT	Health-based	Resolved	2025-02-01 → 2025-02-28
TT	Health-based	Resolved	2022-05-01 → 2022-05-31
TT	Health-based	Resolved	2022-05-01 → 2022-05-31
TT	Health-based	Resolved	2022-03-01 → 2022-03-31
TT	Health-based	Resolved	2022-03-01 → 2022-03-31

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
Arsenic	13 µg/L 130% of the EPA limit, at the 95th percentile of samples — 10 µg/L worst single sample: 35 µg/L	229/244	SYR4	2012–2019
Bromodichloromethane	10 µg/L No EPA limit set worst single sample: 10.2 µg/L	72/82	SYR4	2012–2019
Bromoform	3.945 µg/L No EPA limit set worst single sample: 9.3 µg/L	72/82	SYR4	2012–2019
Dibromochloromethane	9.3675 µg/L No EPA limit set worst single sample: 12.3 µg/L	72/82	SYR4	2012–2019
TTHM	32.725 µg/L 41% of the EPA limit 80 µg/L worst single sample: 37 µg/L	72/72	SYR4	2012–2019
Chloroform	14 µg/L No EPA limit set worst single sample: 23 µg/L	71/82	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	20.65 µg/L 34% of the EPA limit 60 µg/L worst single sample: 26 µg/L	68/72	SYR4	2012–2019
Benzene	13.15 µg/L 263% of the EPA limit, at the 95th percentile of samples — 5 µg/L worst single sample: 16.6 µg/L	66/349	SYR4	2012–2019
Dibromoacetic Acid	5.51 µg/L No EPA limit set worst single sample: 6.3 µg/L	65/72	SYR4	2012–2019
Dichloroacetic Acid	9.095 µg/L No EPA limit set worst single sample: 14 µg/L	64/72	SYR4	2012–2019
Trichloroacetic Acid	6.268 µg/L No EPA limit set worst single sample: 9.38 µg/L	57/72	SYR4	2012–2019
Lead	0.0029 mg/L 19% of the EPA limit 0.0150 mg/L	40/40	LCR	2026
Monobromoacetic Acid	1.7 µg/L No EPA limit set	8/72	SYR4	2012–2019
Fluoride	573 µg/L 14% of the EPA limit 4000 µg/L worst single sample: 600 µg/L	7/7	SYR4	2013–2019
Monochloroacetic Acid	12.14 µg/L No EPA limit set worst single sample: 14 µg/L	7/72	SYR4	2012–2019
Lithium	58 µg/L No EPA limit set	3/8	UCMR-5	2024
Barium	148.5 µg/L 7.4% of the EPA limit 2000 µg/L worst single sample: 150 µg/L	2/7	SYR4	2013–2019
Ethylbenzene	0.6000 µg/L 0.1% of the EPA limit 700 µg/L	1/318	SYR4	2012–2019
Nitrite	0.2200 µg/L 0% of the EPA limit 1000 µg/L	1/11	SYR4	2013–2019
Xylenes, Total	0.5200 µg/L 0% of the EPA limit 10000 µg/L	1/318	SYR4	2012–2019

91 contaminants tested, none detected

1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,3,7,8-TCDD2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalAsbestosAtrazineBhc-GammaBenzo(A)PyreneBeryllium, TotalChlorobenzeneCopperCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumCombined UraniumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoLeadMercuryMethoxychlorNetfosaaNfdhaNmefosaaNitrateNitrate-NitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl Chloridecis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: LUNA, GABINO
Phone: 562-989-7300
Email: gluna@cityofsignalhill.org

Frequently asked questions about Signal Hill - City, Water Dept.

Is Signal Hill - City, Water Dept. tap water safe to drink?

EPA monitoring detected 20 contaminants in Signal Hill - City, Water Dept.'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 Signal Hill - City, Water Dept.'s water?

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

How many people does Signal Hill - City, Water Dept. serve?

Signal Hill - City, Water Dept. reports serving 11,848 people in California, per its EPA record.

Has Signal Hill - City, Water Dept. had any water quality violations?

The EPA has 22 violations on file for Signal Hill - City, Water Dept., 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.