Serving roughly 3,501 people in Sonoma County, California.
Data current as of July 2026
🔍Straight from EPA
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Results for CSP-FORT ROSS STATE PARK
1 water provider directly on file, serving roughly 3,501 people in Sonoma County, California.
Quick answer: CSP-FORT ROSS STATE PARK has no violations on file. One reading is worth knowing about: Arsenic was measured at 140UG/L, among the highest of the 756 providers on file in this area. It's the most notable figure in this system's record among its 756 local peers.
Arsenic
Utility CSP-FORT ROSS STATE PARKPopulation served 3,501Owner State or Territorial Government
No violations on file
Contaminants found
Metals
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Arsenic
Detected: 140 UG/L (ppb)
7/21/2025
Occurs naturally in some groundwater. Long-term exposure above the legal limit (10 ppb) has been linked to increased cancer risk and cardiovascular disease.
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.