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Tap water quality report

Hidden Hollow Mhc

EPA monitoring tested this supplier for 69 contaminants and detected 8. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

69
contaminants tested
8
detected
400
people served
2
health-based violations
California rankingsLead in CaliforniaPFAS in California
Water source
Ground water
Ownership
Mixed public/private
Counties served
Coconino

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.

2
health-based violations
100
violations on file
1
still open
ViolationTypeStatusPeriod
TT Health-based Unaddressed 2021-08-23
MCL Health-based Resolved 1999-12-01 → 1999-12-31
MR Monitoring Resolved 2024-09-08
MR Monitoring Resolved 2024-09-08
RPT Monitoring Resolved 2024-06-01
RPT Monitoring Resolved 2024-06-01
MR Monitoring Resolved 2022-10-01 → 2022-12-31
MR Monitoring Resolved 2022-10-01 → 2022-12-31
RPT Monitoring Resolved 2017-03-01
MR Monitoring Resolved 2015-08-01 → 2015-08-31

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
Arsenic
10.2 µg/L 102%
of the EPA limit, at the 95th percentile of samples — 10 µg/L
worst single sample: 10.5 µg/L
35/38 SYR4 2012–2019
Nitrate
260 µg/L 2.6%
of the EPA limit 10000 µg/L
 16/16 SYR4 2012–2019
Copper
41.5 µg/L 3.2%
of the EPA limit 1300 µg/L
worst single sample: 48 µg/L
14/15 SYR4 2012–2018
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 10/10 LCR 2024
Lead
7.88 µg/L 53%
of the EPA limit 15 µg/L
worst single sample: 11 µg/L
9/15 SYR4 2012–2018
Barium
159.2 µg/L 8%
of the EPA limit 2000 µg/L
worst single sample: 170 µg/L
3/3 SYR4 2012–2018
Chromium
1.1 µg/L 1.1%
of the EPA limit 100 µg/L
 1/3 SYR4 2012–2018
Nitrate-Nitrite
250 µg/L 2.5%
of the EPA limit 10000 µg/L
 1/1 SYR4 2012
61 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane2,3,7,8-TCDD2,4,5-TP2,4-DAntimony, TotalAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneCombined Radium (-226 And -228)DichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneFluorideGlyphosateHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNitriteOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
HIDDEN HOLLOW MHC LLC
Phone
714-960-1833
Email
[email protected]

Frequently asked questions about Hidden Hollow Mhc

Is Hidden Hollow Mhc tap water safe to drink?

EPA monitoring detected 8 contaminants in Hidden Hollow Mhc'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 Hidden Hollow Mhc's water?

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

How many people does Hidden Hollow Mhc serve?

Hidden Hollow Mhc reports serving 400 people in California, per its EPA record.

Has Hidden Hollow Mhc had any water quality violations?

The EPA has 100 violations on file for Hidden Hollow Mhc, of which 2 are health-based (a contaminant limit or required treatment was breached) and 1 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.