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Tap water quality report

Slo Csa No. 10 - Cayucos Wtp

EPA monitoring tested this supplier for 59 contaminants and detected 19. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

59
contaminants tested
19
detected
0
people served
3
health-based violations
California rankingsLead in CaliforniaPFAS in California
Water source
Surface 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.

3
health-based violations
4
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2004-10-01 → 2004-12-31
MCL Health-based Resolved 2004-10-01 → 2004-12-31
TT Health-based Resolved 1993-07-01 → 1993-07-31
MR Monitoring Resolved 1996-10-01 → 1996-10-31

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.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Nitrate
1789.73 µg/L 18%
of the EPA limit 10000 µg/L
worst single sample: 2327.8 µg/L
34/46 SYR4 2012–2019
TTHM
42.55 µg/L 53%
of the EPA limit 80 µg/L
worst single sample: 53.6 µg/L
34/40 SYR4 2012–2019
Bromoform
5.9 µg/L
No EPA limit set
worst single sample: 6.2 µg/L
31/40 SYR4 2012–2019
Dibromochloromethane
10.75 µg/L
No EPA limit set
worst single sample: 12.2 µg/L
31/40 SYR4 2012–2019
Lead
0.0053 mg/L 35%
of the EPA limit 0.0150 mg/L
 31/31 LCR 2020
Chloroform
22.3 µg/L
No EPA limit set
worst single sample: 25.5 µg/L
29/40 SYR4 2012–2019
Bromodichloromethane
11.75 µg/L
No EPA limit set
worst single sample: 15.2 µg/L
28/40 SYR4 2012–2019
Dibromoacetic Acid
3.9 µg/L
No EPA limit set
worst single sample: 4.2 µg/L
26/34 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
14.625 µg/L 24%
of the EPA limit 60 µg/L
worst single sample: 30.3 µg/L
26/34 SYR4 2012–2019
Dichloroacetic Acid
6.5 µg/L
No EPA limit set
worst single sample: 6.8 µg/L
23/34 SYR4 2012–2019
Fluoride
429.95 µg/L 11%
of the EPA limit 4000 µg/L
worst single sample: 619 µg/L
20/20 SYR4 2012–2019
Trichloroacetic Acid
4.96 µg/L
No EPA limit set
worst single sample: 5.1 µg/L
15/34 SYR4 2012–2019
Arsenic
3.25 µg/L 33%
of the EPA limit 10 µg/L
worst single sample: 3.6 µg/L
11/22 SYR4 2012–2019
Barium
110 µg/L 5.5%
of the EPA limit 2000 µg/L
 7/19 SYR4 2012–2019
Nitrate-Nitrite
753000 µg/L 7530%
of the EPA limit, at the 95th percentile of samples — 10000 µg/L
worst single sample: 812000 µg/L
5/16 SYR4 2012–2018
Selenium
33.6 µg/L 67%
of the EPA limit 50 µg/L
worst single sample: 35 µg/L
3/22 SYR4 2012–2019
Chromium
1.2 µg/L 1.2%
of the EPA limit 100 µg/L
 1/25 SYR4 2012–2019
Combined Uranium
0.1356 µg/L 0.5%
of the EPA limit 30 µg/L
 1/1 SYR4 2019
Monochloroacetic Acid
18.8 µg/L
No EPA limit set
 1/34 SYR4 2012–2019
40 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-DichloropropaneAntimony, TotalAsbestosAtrazineBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCopperCyanideCadmiumCarbon TetrachlorideDichloromethaneDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateEthylbenzeneHexachlorobenzeneHexachlorocyclopentadieneLassoLeadMercuryMonobromoacetic AcidNitriteSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTrichloroethyleneVinyl 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 Csa No. 10 - Cayucos Wtp

Is Slo Csa No. 10 - Cayucos Wtp tap water safe to drink?

EPA monitoring detected 19 contaminants in Slo Csa No. 10 - Cayucos Wtp'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 Csa No. 10 - Cayucos Wtp's water?

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

How many people does Slo Csa No. 10 - Cayucos Wtp serve?

Slo Csa No. 10 - Cayucos Wtp reports serving 0 people in California, per its EPA record.

Has Slo Csa No. 10 - Cayucos Wtp had any water quality violations?

The EPA has 4 violations on file for Slo Csa No. 10 - Cayucos Wtp, of which 3 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.