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Tap water quality report

Nacimiento Water Company

EPA monitoring tested this supplier for 58 contaminants and detected 18. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

58
contaminants tested
18
detected
2,181
people served
68
health-based violations
California rankingsLead in CaliforniaPFAS in California
Water source
Surface water
Ownership
Private
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.

68
health-based violations
100
violations on file
2
still open
ViolationTypeStatusPeriod
MCL Health-based Archived 2024-10-01 → 2024-12-31
MCL Health-based Resolved 2023-04-01 → 2023-06-30
MCL Health-based Resolved 2023-04-01 → 2023-06-30
MCL Health-based Resolved 2023-04-01 → 2023-06-30
MCL Health-based Resolved 2023-04-01 → 2023-06-30
MCL Health-based Resolved 2023-01-01 → 2023-03-31
MCL Health-based Resolved 2023-01-01 → 2023-03-31
MCL Health-based Resolved 2023-01-01 → 2023-03-31
MCL Health-based Resolved 2023-01-01 → 2023-03-31
MCL Health-based Resolved 2022-10-01 → 2022-12-31

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.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Bromodichloromethane
12.355 µg/L
No EPA limit set
worst single sample: 15.2 µg/L
40/40 SYR4 2012–2019
Chloroform
94.435 µg/L
No EPA limit set
worst single sample: 148.6 µg/L
40/40 SYR4 2012–2019
Dichloroacetic Acid
47.365 µg/L
No EPA limit set
worst single sample: 63 µg/L
40/40 SYR4 2012–2019
TTHM
117.89 µg/L 147%
of the EPA limit, at the 95th percentile of samples — 80 µg/L
worst single sample: 163.8 µg/L
40/40 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
107.3 µg/L 179%
of the EPA limit, at the 95th percentile of samples — 60 µg/L
worst single sample: 129 µg/L
40/40 SYR4 2012–2019
Trichloroacetic Acid
55.92 µg/L
No EPA limit set
worst single sample: 67.2 µg/L
40/40 SYR4 2012–2019
Monochloroacetic Acid
4.94 µg/L
No EPA limit set
worst single sample: 6 µg/L
25/40 SYR4 2012–2019
Dibromochloromethane
11.6 µg/L
No EPA limit set
worst single sample: 12.2 µg/L
21/40 SYR4 2012–2019
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 17/17 LCR 2024
Fluoride
220.4 µg/L 5.5%
of the EPA limit 4000 µg/L
worst single sample: 240 µg/L
9/9 SYR4 2012–2019
Bromate
4.66 µg/L 47%
of the EPA limit 10 µg/L
worst single sample: 5.2 µg/L
4/30 SYR4 2012–2019
Nitrate
166.11 µg/L 1.7%
of the EPA limit 10000 µg/L
 4/20 SYR4 2012–2019
Arsenic
3.26 µg/L 33%
of the EPA limit 10 µg/L
worst single sample: 3.3 µg/L
2/8 SYR4 2012–2019
Barium
65.65 µg/L 3.3%
of the EPA limit 2000 µg/L
worst single sample: 67 µg/L
2/8 SYR4 2012–2019
Copper
5.21 µg/L 0.4%
of the EPA limit 1300 µg/L
worst single sample: 5.4 µg/L
2/11 SYR4 2012–2019
Dibromoacetic Acid
1.3 µg/L
No EPA limit set
 2/40 SYR4 2012–2019
Cadmium
5.2 µg/L 104%
of the EPA limit, at the 95th percentile of samples — 5 µg/L
 1/8 SYR4 2012–2019
Chromium
7.4 µg/L 7.4%
of the EPA limit 100 µg/L
 1/8 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, TotalBromoformChlorobenzeneCyanideCarbon TetrachlorideDichloromethaneDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateEthylbenzeneHexachlorobenzeneHexachlorocyclopentadieneLeadMercuryMonobromoacetic AcidNitrate-NitriteNitriteSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
BEAN, TIM
Phone
805-472-2540
Email
ops@nacimientowater.com

Frequently asked questions about Nacimiento Water Company

Is Nacimiento Water Company tap water safe to drink?

EPA monitoring detected 18 contaminants in Nacimiento Water Company'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 Nacimiento Water Company's water?

EPA monitoring detected Bromodichloromethane, Chloroform, Dichloroacetic Acid, TTHM, Total Haloacetic Acids (HAA5), and others. The full list with the level and data source for each is above.

How many people does Nacimiento Water Company serve?

Nacimiento Water Company reports serving 2,181 people in California, per its EPA record.

Has Nacimiento Water Company had any water quality violations?

The EPA has 100 violations on file for Nacimiento Water Company, of which 68 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.