Sierra Company W.w.d #1 Calpine
EPA ID: CA4600019 · 182 people served · 1 ZIP code
Zero violations in five consecutive years of EPA monitoring — Sierra Company W.w.d #1 Calpine has held a clean track record across every reporting cycle in that span, with no enforcement activity of any kind on file for the full service population of 182 residents.
Data: EPA SDWIS Last verified: 2026-04-02
Service Area Map
Coverage area for Sierra Company W.w.d #1 Calpine Source: EPA SDWIS service area boundaries.
Service area boundary — Grade B
💧 Where Does Your Water Come From?
Sierra Company W.w.d #1 Calpine's water is pumped from underground aquifers. Groundwater is naturally filtered through rock and soil, but it can be vulnerable to PFAS contamination, nitrates from agriculture, and industrial chemicals that seep into the water table.
About 1% of homes in Sierra County, California rely on private wells rather than public water systems. Private well owners are responsible for their own water testing and treatment.
Infrastructure Risk
Comparable Water Systems
Similar-sized systems in California
Estimated Remediation Costs
Average estimated costs across ZIP codes served by this system
Based on national averages for common remediation projects. Actual costs vary by property. Only issues flagged by EPA, FEMA, or state data for each ZIP code are included.
System Overview
Sierra Company W.w.d #1 Calpine (EPA ID: CA4600019) is a community water system in California that serves approximately 182 people from groundwater sources.
This system serves ZIP code 96124 in Calpine.
Average Home Safety Score: B (72/100)
Based on water quality violations, lead levels, and radon risk across all ZIP codes served by this system.
Violation History
Lead & Copper
No Lead and Copper Rule sampling data available for this water system.
Radon Risk in Service Area
Dominant radon zone for ZIP codes served by this system: Zone 2 (Moderate Risk)
The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.
Need help with your water quality?
Typical cost: Water test: typically $20–$50 (DIY kit) · Professional inspection: $150–$400
Find the Right Water FilterFree tip: Let cold water run for 2 minutes before drinking — this helps flush lead from your pipes.
ZIP Codes Served
- 96124 — Calpine
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Sierra Company W.w.d #1 Calpine (CA4600019) on EPA.gov.
Frequently Asked Questions
Is Sierra Company W.w.d #1 Calpine water safe to drink?
Based on EPA records, Sierra Company W.w.d #1 Calpine has no recorded violations in the past 5 years — a positive indicator of water quality management.
How many people does Sierra Company W.w.d #1 Calpine serve?
Sierra Company W.w.d #1 Calpine serves approximately 182 people across 1 ZIP code in California.
Where does Sierra Company W.w.d #1 Calpine get its water?
The primary water source is groundwater.
Contact Your Water Utility
Public-record contact information for the water utility serving this system. Use these channels to request water quality reports, ask about service, or report issues directly.
Contact information from Sierra County Waterworks District #1 Calpine Consumer Confidence Report.
ZipCheckup is not affiliated with this water utility, does not act as its agent, and does not provide customer support for it. Contact details shown are public-record information from CCR filings. For service issues, contact the utility directly using the information above.
Water Source & Treatment
Where this water originates and how it's treated before reaching your tap.
Source: Sierra County Waterworks District #1 Calpine Consumer Confidence Report.
ZipCheckup is not affiliated with this water utility. Treatment and source data are sourced from the utility's published CCR filings.
Treatment regime
How this utility classifies its treatment process and what each reported treatment chemical does.
Watershed exposure sources reported
Land-use and natural conditions identified in the utility's source-water assessment as potential contamination sources upstream of treatment.
Treatment classification and chemical list sourced from Sierra County Waterworks District #1 Calpine Consumer Confidence Report.
Treatment intensity is a ZipCheckup-derived classification based on the chemicals and processes the utility reports. Chemicals and contamination sources are taken verbatim from the utility's CCR filing. Routine federal monitoring and contaminant testing shown elsewhere on this page determine whether the water meets safety standards, not the treatment classification.
Lead Service Line Inventory
Service line breakdown reported under the federal Lead and Copper Rule Improvements (LCRI) inventory requirement:
This system reports zero confirmed lead service lines in its inventory. Unknown-material counts may still warrant verification.
Federal LCRI rule (effective October 2024) requires every public water system to inventory its service lines and complete lead-line replacement within 10 years.
Source: EPA SDWIS Federal Service Line Inventory (Phase 2) · Submitted 2026
ZipCheckup is not affiliated with the utility or state agency. Inventory figures render verbatim from the public LCRI submission cited above; ZipCheckup does not perform inspections or replacements.