Serving roughly 5,300 people in Madera County, California.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
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Results for YOSEMITE SPRING PARK UTIL CO
1 water provider directly on file, serving roughly 5,300 people in Madera County, California.
Quick answer: YOSEMITE SPRING PARK UTIL CO currently has an open health-based violation on file: Lead And Copper Rule Revisions, a compliance issue since 10/17/2024. This is active, not historical — see the violation detail below for what EPA's enforcement record shows.
Lead Summary
Lithium
PFBS
PFOS
PFOA
PFPEA
PFHXA
PFHXS
Aggressive Index
Langelier Index (pH(s))
Magnesium
Potassium
Sodium
Calcium
Alkalinity, Total
Alkalinity, Bicarbonate
Hardness, Total (ASCACO3)
Foamingagents (SURFACTANTS)
TDS
Chloride
Sulfate
Fluoride
Nitrate-Nitrite
Nitrate
Perfluorobutanesulfonicacid (PFBS)
Perfluorohexanesulfonicacid (PFHxS)
Perfluoroctanesulfonicacid (PFOS)
Perfluoroctanoicacid (PFOA)
Perfluorohexanoicacid (PFHXA)
Perfluorobutanoicacid (PFBA)
Perfluoropentanoicacid (PFPEA)
Turbidity
Gross Alpha Particle Activity
pH
Iron
Manganese
Arsenic
Copper, Free
Conductivity (at 25°C)
Color
Utility YOSEMITE SPRING PARK UTIL COPopulation served 5,300Owner Private
Open violation on file
Violations on file
Lead And Copper Rule Revisions
Currently open health violation
Found at 1 of 1 provider
Contaminants found
Metals
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0.0084 mg/L (ppm)
12/31/2022
Iron
Detected: 1100 UG/L (ppb)
10/16/2025
Mostly an aesthetic issue (metallic taste, staining) rather than a health concern at typical levels.
Manganese
Detected: 220 UG/L (ppb)
10/16/2025
Mainly a taste/staining concern at typical levels; long-term neurological research at high chronic exposure is ongoing.
Arsenic
Detected: 3.4 UG/L (ppb)
4/8/2025
Occurs naturally in some groundwater. Long-term exposure above the legal limit (10 ppb) has been linked to increased cancer risk and cardiovascular disease.
Copper, Free
Detected: 7 UG/L (ppb)
4/8/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Chloride
Detected: 27 MG/L (ppm)
4/8/2025
Sulfate
Detected: 41 MG/L (ppm)
4/8/2025
Fluoride
Detected: 0.24 MG/L (ppm)
5/14/2025
Often added deliberately for dental health; can also occur naturally.
Nitrate-Nitrite
Detected: 1.1 MG/L (ppm)
4/8/2025
Nitrate
Detected: 1.1 MG/L (ppm)
4/8/2025
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: 9.1 MG/L (ppm)
4/8/2025
Potassium
Detected: 4.3 MG/L (ppm)
4/8/2025
Sodium
Detected: 26 MG/L (ppm)
4/8/2025
Calcium
Detected: 48 MG/L (ppm)
4/8/2025
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Langelier Index (pH(s))
Detected: -0.5 LANG
4/8/2025
Hardness, Total (ASCACO3)
Detected: 160 MG/L (ppm)
4/8/2025
Gross Alpha Particle Activity
Detected: 18.6 PCI/L
8/14/2025
pH
Detected: 7.3 PH
4/8/2025
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: 82.4 µg/L (ppb)
9/9/2025
Occurs naturally in some groundwater. Not currently federally regulated in drinking water.
PFBS
Detected: 0.0128 µg/L (ppb)
10/8/2025
PFOS
Detected: 0.0079 µg/L (ppb)
10/8/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
PFOA
Detected: 0.0075 µg/L (ppb)
10/8/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
PFPEA
Detected: 0.0037 µg/L (ppb)
10/8/2025
PFHXA
Detected: 0.0033 µg/L (ppb)
3/4/2025
PFHXS
Detected: 0.0067 µg/L (ppb)
9/9/2025
Calculated Parameters
Values worked out mathematically from other test results, not measured directly
Alkalinity, Bicarbonate
Detected: 130 MG/L (ppm)
4/8/2025
Other
Additional substances tested that don't fit neatly into the categories above
Aggressive Index
Detected: 11.5 AGGR
4/8/2025
Alkalinity, Total
Detected: 130 MG/L (ppm)
4/8/2025
Foamingagents (SURFACTANTS)
Detected: 0.18 MG/L (ppm)
4/8/2025
TDS
Detected: 300 MG/L (ppm)
4/8/2025
Perfluorobutanesulfonicacid (PFBS)
Detected: 17 NG/L (ppt)
7/17/2025
Perfluorohexanesulfonicacid (PFHxS)
Detected: 2.8 NG/L (ppt)
7/17/2025
Perfluoroctanesulfonicacid (PFOS)
Detected: 9.5 NG/L (ppt)
7/17/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Perfluoroctanoicacid (PFOA)
Detected: 8.1 NG/L (ppt)
7/17/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Perfluorohexanoicacid (PFHXA)
Detected: 3.5 NG/L (ppt)
7/17/2025
Perfluorobutanoicacid (PFBA)
Detected: 4.4 NG/L (ppt)
7/17/2025
Perfluoropentanoicacid (PFPEA)
Detected: 4.5 NG/L (ppt)
7/17/2025
Turbidity
Detected: 0.57 NTU
4/8/2025
A measure of water cloudiness from suspended particles.
Conductivity (at 25°C)
Detected: 450 UMHO/CM
4/8/2025
Color
Detected: 5 UNITS
4/8/2025
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.