Is Slo Cwwd No. 23 - Santa Margarita Tap Water Safe? Quality Report

Water source: Ground water
Ownership: Local government
Counties served: San Luis Obispo

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
MON	Monitoring	Resolved	2016-08-01 → 2016-08-31
MON	Monitoring	Resolved	2016-08-01 → 2016-08-31

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	7.14 µg/L 71% of the EPA limit 10 µg/L worst single sample: 26 µg/L	73/100	SYR4	2012–2019
Nitrate	3911 µg/L 39% of the EPA limit 10000 µg/L worst single sample: 4540 µg/L	38/56	SYR4	2012–2019
Lead	0.0 mg/L 0% of the EPA limit 0.0150 mg/L	19/19	LCR	2023
Dibromochloromethane	4 µg/L No EPA limit set worst single sample: 4.6 µg/L	6/11	SYR4	2012–2019
Fluoride	194.75 µg/L 4.9% of the EPA limit 4000 µg/L worst single sample: 204 µg/L	6/8	SYR4	2014–2019
TTHM	11.875 µg/L 15% of the EPA limit 80 µg/L worst single sample: 13.6 µg/L	6/11	SYR4	2012–2019
Barium	90.6 µg/L 4.5% of the EPA limit 2000 µg/L worst single sample: 91 µg/L	5/11	SYR4	2012–2019
Bromodichloromethane	4.055 µg/L No EPA limit set worst single sample: 4.4 µg/L	4/11	SYR4	2012–2019
Chloroform	2.915 µg/L No EPA limit set worst single sample: 3.2 µg/L	4/11	SYR4	2012–2019
Nitrate-Nitrite	652500 µg/L 6525% of the EPA limit, at the 95th percentile of samples — 10000 µg/L worst single sample: 675000 µg/L	4/6	SYR4	2014–2017
Bromoform	1.385 µg/L No EPA limit set worst single sample: 1.4 µg/L	2/11	SYR4	2012–2019
Dibromoacetic Acid	1.96 µg/L No EPA limit set worst single sample: 2 µg/L	2/11	SYR4	2012–2019
Dichloroacetic Acid	2.65 µg/L No EPA limit set worst single sample: 2.7 µg/L	2/11	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	3.89 µg/L 6.5% of the EPA limit 60 µg/L worst single sample: 3.9 µg/L	2/11	SYR4	2012–2019

46 contaminants tested, none detected

1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-DichloropropaneAntimony, TotalAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCopperCyanideCadmiumCarbon TetrachlorideChromiumDichloromethaneDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateEthylbenzeneHexachlorobenzeneHexachlorocyclopentadieneLassoLeadMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNitriteSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTrichloroacetic AcidTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: RUEDAS, DANIELLE
Phone: 805-473-7156
Email: druedas@co.slo.ca.us

Frequently asked questions about Slo Cwwd No. 23 - Santa Margarita

Is Slo Cwwd No. 23 - Santa Margarita tap water safe to drink?

EPA monitoring detected 14 contaminants in Slo Cwwd No. 23 - Santa Margarita'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 Slo Cwwd No. 23 - Santa Margarita's water?

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

How many people does Slo Cwwd No. 23 - Santa Margarita serve?

Slo Cwwd No. 23 - Santa Margarita reports serving 1,291 people in California, per its EPA record.

Has Slo Cwwd No. 23 - Santa Margarita had any water quality violations?

The EPA has 2 violations on file for Slo Cwwd No. 23 - Santa Margarita, of which 0 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.