MAMMOTH MOUNTAIN SKI AREA - OUTPOST 14 Water Quality Report
Serving roughly 7,736 people in Mono County, California.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
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Results for MAMMOTH MOUNTAIN SKI AREA - OUTPOST 14
1 water provider directly on file, serving roughly 7,736 people in Mono County, California.
Quick answer: MAMMOTH MOUNTAIN SKI AREA - OUTPOST 14 has no violations on file. One reading is worth knowing about: Lead was measured at 4.9UG/L, among the highest of the 127 providers on file in this area. It's the most notable figure in this system's record among its 127 local peers.
Lead Summary
Lithium
Lead
Copper, Free
Magnesium
Potassium
Sodium
Calcium
Alkalinity, Total
Alkalinity, Bicarbonate
Hardness, Total (ASCACO3)
TDS
Chloride
Sulfate
Nitrate
Gross Alpha Particle Activity
Gross Beta Particle Activity
pH
Barium
Aluminum
Zinc
Conductivity (at 25°C)
Utility MAMMOTH MOUNTAIN SKI AREA - OUTPOST 14Population served 7,736Owner Private
No violations on file
Contaminants found
Metals
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0 mg/L (ppm)
12/31/2019
Lead
Detected: 4.9 UG/L (ppb)
10/21/2025
A metal that can leach from old pipes, solder, and fixtures. Current medical guidance holds there is no truly safe level of lead exposure, especially for children and pregnant women.
Copper, Free
Detected: 110 UG/L (ppb)
10/21/2025
Barium
Detected: 120 UG/L (ppb)
7/21/2025
Aluminum
Detected: 93 UG/L (ppb)
7/21/2025
Zinc
Detected: 34 UG/L (ppb)
7/21/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Chloride
Detected: 20 MG/L (ppm)
7/21/2025
Sulfate
Detected: 1.3 MG/L (ppm)
7/21/2025
Nitrate
Detected: 0.26 MG/L (ppm)
7/21/2025
Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.
Minerals
Everyday minerals that mainly affect taste and water hardness
Magnesium
Detected: 28 MG/L (ppm)
7/21/2025
Potassium
Detected: 5.2 MG/L (ppm)
7/21/2025
Sodium
Detected: 110 MG/L (ppm)
7/21/2025
Calcium
Detected: 73 MG/L (ppm)
7/21/2025
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Hardness, Total (ASCACO3)
Detected: 300 MG/L (ppm)
7/21/2025
Gross Alpha Particle Activity
Detected: 2.28 PCI/L
7/21/2025
pH
Detected: 6.1 PH
7/21/2025
A measure of how acidic or basic the water is (7 is neutral). Affects taste and plumbing, not a direct health measure.
PFAS & Emerging Contaminants
Human-made "forever chemicals" and other substances not yet fully regulated
Lithium
Detected: 12 µg/L (ppb)
11/6/2024
Occurs naturally in some groundwater. Not currently federally regulated in drinking water.
Calculated Parameters
Values worked out mathematically from other test results, not measured directly
Alkalinity, Bicarbonate
Detected: 76 MG/L (ppm)
7/21/2025
Other
Additional substances tested that don't fit neatly into the categories above
Alkalinity, Total
Detected: 76 MG/L (ppm)
7/21/2025
TDS
Detected: 160 MG/L (ppm)
7/21/2025
Gross Beta Particle Activity
Detected: 13 PCI/L
7/21/2025
Conductivity (at 25°C)
Detected: 200 UMHO/CM
7/21/2025
Filtration considerations: See the table below for how whole-house carbon, under-sink reverse osmosis, and under-sink carbon systems compare against what's actually on file here. These are general system types, not a specific product recommendation.