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Tap water quality report

Vierra Knolls Mwc

EPA monitoring tested this supplier for 51 contaminants and detected 4. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

51
contaminants tested
4
detected
66
people served
17
health-based violations
California rankingsLead in CaliforniaPFAS in California
Water source
Ground water
Ownership
Private
Counties served
Monterey

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.

17
health-based violations
21
violations on file
2
still open
ViolationTypeStatusPeriod
TT Health-based Unaddressed 2024-10-17
MCL Health-based Resolved 2013-11-01 → 2013-11-30
MCL Health-based Resolved 2013-11-01 → 2013-11-30
MCL Health-based Resolved 2013-11-01 → 2013-11-30
MCL Health-based Resolved 2009-05-01 → 2009-05-31
MCL Health-based Resolved 2009-05-01 → 2009-05-31
MCL Health-based Resolved 2009-05-01 → 2009-05-31
MCL Health-based Resolved 2006-08-01 → 2006-08-31
MCL Health-based Resolved 2006-08-01 → 2006-08-31
MCL Health-based Resolved 2006-08-01 → 2006-08-31

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.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Nitrate
1400 µg/L 14%
of the EPA limit 10000 µg/L
 16/16 SYR4 2012–2019
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 4/4 LCR 2023
Fluoride
229 µg/L 5.7%
of the EPA limit 4000 µg/L
worst single sample: 230 µg/L
2/2 SYR4 2014–2017
Nitrate-Nitrite
1200 µg/L 12%
of the EPA limit 10000 µg/L
 1/1 SYR4 2017
47 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-Dichloropropane2,4,5-TP2,4-DAntimony, TotalArsenicAsbestosAtrazineBariumBenzeneBeryllium, TotalChlorobenzeneCopperCyanideCadmiumCarbofuranCarbon TetrachlorideChromiumDichloromethaneDalaponDinosebDiquatEthylbenzeneLassoLeadMercuryNitriteOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
HOFFMAN, NORM
Phone
831-663-1949
Email
normweather@gmail.com

Frequently asked questions about Vierra Knolls Mwc

Is Vierra Knolls Mwc tap water safe to drink?

EPA monitoring detected 4 contaminants in Vierra Knolls Mwc'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 Vierra Knolls Mwc's water?

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

How many people does Vierra Knolls Mwc serve?

Vierra Knolls Mwc reports serving 66 people in California, per its EPA record.

Has Vierra Knolls Mwc had any water quality violations?

The EPA has 21 violations on file for Vierra Knolls Mwc, of which 17 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.