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Tap water quality report

Monte Sereno Mutual Benefit Water

EPA monitoring tested this supplier for 54 contaminants and detected 18. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

54
contaminants tested
18
detected
65
people served
0
health-based violations
California rankingsLead in CaliforniaPFAS in California
Water source
Ground water
Ownership
Private
Counties served
San Luis Obispo

Compliance record

No violations on file. The EPA has no formal drinking-water violations recorded for this supplier.

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
Fluoride
285 µg/L 7.1%
of the EPA limit 4000 µg/L
worst single sample: 290 µg/L
6/6 SYR4 2013–2019
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 5/5 LCR 2024
Barium
102.85 µg/L 5.1%
of the EPA limit 2000 µg/L
worst single sample: 103 µg/L
2/6 SYR4 2013–2019
Bromodichloromethane
33.9 µg/L
No EPA limit set
worst single sample: 34 µg/L
2/2 SYR4 2019
Bromoform
12.95 µg/L
No EPA limit set
worst single sample: 13 µg/L
2/2 SYR4 2019
Chloroform
16.9 µg/L
No EPA limit set
worst single sample: 17 µg/L
2/2 SYR4 2019
Dibromochloromethane
45.65 µg/L
No EPA limit set
worst single sample: 46 µg/L
2/2 SYR4 2019
TTHM
109.5 µg/L 137%
of the EPA limit, at the 95th percentile of samples — 80 µg/L
worst single sample: 110 µg/L
2/2 SYR4 2019
Copper
20 µg/L 1.5%
of the EPA limit 1300 µg/L
 1/6 SYR4 2013–2019
Chromium
2 µg/L 2%
of the EPA limit 100 µg/L
 1/6 SYR4 2013–2019
Dibromoacetic Acid
12 µg/L
No EPA limit set
 1/1 SYR4 2019
Dichloroacetic Acid
12 µg/L
No EPA limit set
 1/1 SYR4 2019
Lead
0.2000 µg/L 1.3%
of the EPA limit 15 µg/L
 1/6 SYR4 2013–2019
Monobromoacetic Acid
1.5 µg/L
No EPA limit set
 1/1 SYR4 2019
Monochloroacetic Acid
2.2 µg/L
No EPA limit set
 1/1 SYR4 2019
Toluene
0.6600 µg/L 0.1%
of the EPA limit 1000 µg/L
 1/8 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
31 µg/L 52%
of the EPA limit 60 µg/L
 1/1 SYR4 2019
Trichloroacetic Acid
4.2 µg/L
No EPA limit set
 1/1 SYR4 2019
36 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-DichloropropaneAntimony, TotalArsenicAtrazineBenzeneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbon TetrachlorideDichloromethaneEthylene DibromideEthylbenzeneLassoMercuryNitrateNitrate-NitriteNitriteSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
ROINESTAD, KATHY
Phone
805-478-9931
Email
kr@alanroinestad.com

Frequently asked questions about Monte Sereno Mutual Benefit Water

Is Monte Sereno Mutual Benefit Water tap water safe to drink?

EPA monitoring detected 18 contaminants in Monte Sereno Mutual Benefit Water'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 Monte Sereno Mutual Benefit Water's water?

EPA monitoring detected Fluoride, Lead, Barium, Bromodichloromethane, Bromoform, and others. The full list with the level and data source for each is above.

How many people does Monte Sereno Mutual Benefit Water serve?

Monte Sereno Mutual Benefit Water reports serving 65 people in California, per its EPA record.

Has Monte Sereno Mutual Benefit Water had any water quality violations?

The EPA has no formal drinking-water violations on file for Monte Sereno Mutual Benefit Water.

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.