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Tap water quality report

Md 73 Quartz Mountain

EPA monitoring tested this supplier for 43 contaminants and detected 10. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

43
contaminants tested
10
detected
375
people served
0
health-based violations
California rankingsLead in CaliforniaPFAS in California
Water source
Ground water
Ownership
Local government
Counties served
Madera

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.

0
health-based violations
10
violations on file
0
still open
ViolationTypeStatusPeriod
MR Monitoring Archived 2016-01-01 → 2024-12-31
MR Monitoring Resolved 2016-01-01 → 2024-12-31
MR Monitoring Resolved 2016-01-01 → 2024-12-31
MR Monitoring Resolved 2013-01-01 → 2013-12-31
MR Monitoring Resolved 2013-01-01 → 2013-12-31
MR Monitoring Resolved 2013-01-01 → 2013-12-31
MR Monitoring Resolved 2008-04-01 → 2008-04-30
MR Monitoring Resolved 2008-04-01 → 2008-04-30
MR Monitoring Resolved 2008-04-01 → 2008-04-30
MR Monitoring Resolved 2005-01-01

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
Barium
12.7 µg/L 0.6%
of the EPA limit 2000 µg/L
worst single sample: 13 µg/L
7/7 SYR4 2014–2018
Arsenic
1.7 µg/L 17%
of the EPA limit 10 µg/L
worst single sample: 1.8 µg/L
6/7 SYR4 2014–2018
Fluoride
195 µg/L 4.9%
of the EPA limit 4000 µg/L
worst single sample: 200 µg/L
6/7 SYR4 2014–2018
Combined Radium (-226 And -228)
3.402 pCi/L 68%
of the EPA limit 5 pCi/L
worst single sample: 3.5 pCi/L
3/3 SYR4 2014–2015
Lead
0.0050 mg/L 33%
of the EPA limit 0.0150 mg/L
 3/3 LCR 2023
Nitrate
710 µg/L 7.1%
of the EPA limit 10000 µg/L
 2/56 SYR4 2012–2019
Beryllium, Total
1.7 µg/L 43%
of the EPA limit 4 µg/L
 1/7 SYR4 2014–2018
Copper
20 µg/L 1.5%
of the EPA limit 1300 µg/L
 1/7 SYR4 2014–2018
Combined Uranium
2.49575 µg/L 8.3%
of the EPA limit 30 µg/L
 1/1 SYR4 2014
Lead
1.3 µg/L 8.7%
of the EPA limit 15 µg/L
 1/7 SYR4 2014–2018
33 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-DichloropropaneAntimony, TotalAsbestosAtrazineBenzeneChlorobenzeneCyanideCadmiumCarbon TetrachlorideChromiumDichloromethaneEthylbenzeneLassoMercuryNitriteSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
BROWN, CHAD
Phone
559-675-7820
Email
chad.brown@maderacounty.com

Frequently asked questions about Md 73 Quartz Mountain

Is Md 73 Quartz Mountain tap water safe to drink?

EPA monitoring detected 10 contaminants in Md 73 Quartz Mountain'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 Md 73 Quartz Mountain's water?

EPA monitoring detected Barium, Arsenic, Fluoride, Combined Radium (-226 And -228), Lead, and others. The full list with the level and data source for each is above.

How many people does Md 73 Quartz Mountain serve?

Md 73 Quartz Mountain reports serving 375 people in California, per its EPA record.

Has Md 73 Quartz Mountain had any water quality violations?

The EPA has 10 violations on file for Md 73 Quartz Mountain, 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.