Is Rainbow Municipal Wd Tap Water Safe? Quality Report

Water source: SWP
Ownership: Local government
Counties served: San Diego

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	2003-12-01 → 2003-12-31
MCL	Health-based	Resolved	2003-12-01 → 2003-12-31
MCL	Health-based	Resolved	1993-10-01 → 1993-10-31
MCL	Health-based	Resolved	1993-10-01 → 1993-10-31
MCL	Health-based	Resolved	1993-09-01 → 1993-09-30
MCL	Health-based	Resolved	1993-09-01 → 1993-09-30
Other	Monitoring	Resolved	2006-01-01 → 2010-01-01
Other	Monitoring	Resolved	2006-01-01 → 2010-01-01
Other	Monitoring	Archived	1989-01-01 → 1989-01-31

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 single worst sample on record — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately.

Contaminant	Level vs EPA limit	Detection rate	Source	Period
Bromodichloromethane	17 µg/L No EPA limit set	112/112	SYR4	2012–2019
Chloroform	18 µg/L No EPA limit set	112/112	SYR4	2012–2019
Dibromochloromethane	20 µg/L No EPA limit set	112/112	SYR4	2012–2019
TTHM	57 µg/L 71% of the EPA limit 80 µg/L	112/112	SYR4	2012–2019
Bromoform	10 µg/L No EPA limit set	111/112	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	94 µg/L 157% of the EPA limit, in the worst sample — 60 µg/L	108/116	SYR4	2012–2019
Dichloroacetic Acid	8.2 µg/L No EPA limit set	101/116	SYR4	2012–2019
Dibromoacetic Acid	4.4 µg/L No EPA limit set	91/116	SYR4	2012–2019
Trichloroacetic Acid	8.3 µg/L No EPA limit set	82/116	SYR4	2012–2019
Monochloroacetic Acid	86 µg/L No EPA limit set	62/116	SYR4	2012–2019
Monobromoacetic Acid	2.6 µg/L No EPA limit set	30/116	SYR4	2012–2019
Lead	0.0027 mg/L 18% of the EPA limit 0.0150 mg/L	22/22	LCR	2024
Lithium	44 µg/L No EPA limit set	4/4	UCMR-5	2025

29 contaminants tested, none detected

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Utility contact

Contact: WILEY, JAKE
Phone: 760-728-1178
Email: Jwiley@rainbowmwd.ca.gov

Frequently asked questions about Rainbow Municipal Wd

Is Rainbow Municipal Wd tap water safe to drink?

EPA monitoring detected 13 contaminants in Rainbow Municipal Wd'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 Rainbow Municipal Wd's water?

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

How many people does Rainbow Municipal Wd serve?

Rainbow Municipal Wd reports serving 23,536 people in California, per its EPA record.

Has Rainbow Municipal Wd had any water quality violations?

The EPA has 9 violations on file for Rainbow Municipal Wd, of which 6 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.