← Check another ZIP · Water quality in COARSEGOLD, CA
YOSEMITE SPRING PARK UTIL CO
COARSEGOLD, CA · 5,300 people served · EPA PWSID CA2010005
YOSEMITE SPRING PARK UTIL CO (COARSEGOLD, CA), which serves about 5,300 people, has recorded 3 health-based drinking-water contaminants in EPA violation records since 2016, most notably Copper, Fluoride, Lead. EPA's UCMR5 program detected PFAS 'forever chemicals' in this system: PFHxS (0.0138 µg/L), PFBS (0.0131 µg/L), PFOS (0.0079 µg/L). PFOA/PFOS levels exceed the 2024 federal limit of 4 ppt (0.004 µg/L). A certified water filter can reduce these at the tap — see the certified options for each below.
What the testing found
Measured levels from EPA violation records, compared to the federal limit (MCL). The black line marks the legal limit.
Fluoride
Within federal limitAdded for dental health at ~0.7 mg/L; EPA MCL 4 mg/L. Excess causes dental/skeletal fluorosis. Can be naturally high in some groundwater.
Lead
Within federal limitNo safe level. Damages developing brain/nervous system in children; linked to lower IQ, kidney and cardiovascular harm in adults. Usually enters water from corroding pipes/solder, not the source.
PFAS "forever chemicals"
Detected by EPA's UCMR5 monitoring. The 2024 federal limit for PFOA and PFOS is 4 ppt (0.004 µg/L).
PFHxS
DetectedPFBS
DetectedPFOS
2.0× the 4 ppt limitPFOA
1.9× the 4 ppt limitPFPeA
DetectedPFHxA
DetectedAlso on record
Copper
1 violationRecorded as a federal action-level / treatment violation (1 since 2016). Measured 90th-percentile levels are reported separately under the Lead & Copper Rule.
Short-term: nausea/vomiting/cramps; long-term: liver/kidney damage. Leaches from copper plumbing, worse with corrosive water.
Filters certified to clean up your water
Your water shows Copper, Fluoride, Lead, PFOA, and 2 more. A refrigerator filter handles the most of this in one unit — these three are independently certified for the most of your contaminants (not marketing claims):
Your water also has Fluoride — only reverse osmosis reliably removes these dissolved contaminants. See the best RO systems →
Compare all certified refrigerator filters →
Want certainty about your tap specifically (not just the system)? A certified mail-in lab test is the gold standard — system-wide records can differ from your home's plumbing. Some links above are affiliate links — see our disclosure.
Sources & method. Contaminant levels and violations come from EPA's Safe Drinking Water Information System (health-based violations, 2016–present); PFAS from EPA UCMR5 monitoring (2023–2025). Levels shown are the highest recorded value in the violation records; a violation means the contaminant exceeded its federal limit at the system level. Your home's water can differ from the system average. Public domain data; we are not affiliated with the EPA.