Butano Canyon Mutual
EPA ID: CA4100503 · 150 people served · 1 ZIP code
Over the tracked period, Butano Canyon Mutual logged 9 EPA violations — each has been remedied, and the system now supplies 150 people in good standing.
Data: EPA SDWIS Last verified: 2026-04-02
Compliance Trajectory
Stable · Risk tier: High · 95% chance of violation in next 12 months
Violations went from 1 (2024) to 1 (2025). Violation counts have remained relatively steady.
Service Area Map
Coverage area for Butano Canyon Mutual Source: EPA SDWIS service area boundaries.
Service area boundary — Grade C
Service Area Demographics
The Butano Canyon Mutual serves a community with a median household income of $111,351 and an estimated 1,389 residents across its service area. Approximately 78% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
🌊 Where Does Your Water Come From?
Butano Canyon Mutual's water is drawn from rivers, lakes, or reservoirs. Surface water sources are more exposed to agricultural runoff, stormwater, and upstream discharges, but they typically receive more intensive treatment before reaching your tap.
About 1% of homes in San Mateo County, California rely on private wells rather than public water systems. Private well owners are responsible for their own water testing and treatment.
Superfund Proximity Note: This service area ranks in the 60th percentile nationally for proximity to Superfund (NPL) sites.
Infrastructure Risk
Detected Contaminants
How Butano Canyon Mutual compares to EPA limits
What This Means For You
Mercury at 4 mg/L exceeds the EPA maximum of 0.002 mg/L. Kidney damage, neurological impairment. Consider activated carbon (GAC) filtration.
Haloacetic Acids (HAA5) at 1 mg/L exceeds the EPA maximum of 0.06 mg/L. Cancer risk; reproductive & developmental effects. Consider granular activated carbon (GAC) filtration.
Consumer Confidence Report Rule at 2 mg/L exceeds the EPA maximum of mg/L.
Total Coliform at 1 presence exceeds the EPA maximum of presence.
Surface Water Treatment Rule at 1 mg/L exceeds the EPA maximum of mg/L.
Mercury was detected in this water system. activated carbon (GAC) filtration can reduce exposure.
Find a certified water filter →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
Butano Canyon Mutual (EPA ID: CA4100503) is a community water system in California that serves approximately 150 people from surface water sources.
This system serves ZIP code 94060 in Pescadero.
Average Home Safety Score: C (63/100)
Based on water quality violations, lead levels, and radon risk across all ZIP codes served by this system.
Violation History
Recent Violations
| Date | Contaminant | Type | Status |
|---|---|---|---|
| January 1, 2024 | Mercury | Health-based | Resolved |
| November 15, 2023 | Total Coliform | Monitoring | Resolved |
| April 1, 2023 | Mercury | Monitoring | Resolved |
Contaminants Detected
The following contaminants have been flagged in EPA records for this water system:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Mercury | Inorganic | 4 | Yes |
| Consumer Confidence Report Rule | Reporting Failure | 2 | No |
| Haloacetic Acids (HAA5) | Disinfection Byproducts | 1 | No |
| Total Coliform | Microbiological | 1 | No |
| Surface Water Treatment Rule | Treatment Failure | 1 | No |
Health Risk Details
Mercury (Inorganic) (EPA limit: 0.002 mg/L)
Kidney damage, neurological impairment At-risk groups: pregnant women, developing fetuses, people with impaired kidney function.
Removal methods: activated carbon (GAC), coagulation/filtration, reverse osmosis. Find the right filter →
Lead & Copper
EPA Lead and Copper Rule sampling data for ZIP codes served by this system:
| ZIP Code | Lead Level | Exceeds Limit | Sample Date |
|---|---|---|---|
| 94060 | 0.0087 mg/L | No | N/A |
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
- 94060 — Pescadero
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Butano Canyon Mutual (CA4100503) on EPA.gov.
Frequently Asked Questions
Is Butano Canyon Mutual water safe to drink?
Butano Canyon Mutual has recorded 1 health-based violation in the past 5 years. While the system is required to treat water to meet federal standards, you may want to consider additional precautions such as a certified water filter.
How many people does Butano Canyon Mutual serve?
Butano Canyon Mutual serves approximately 150 people across 1 ZIP code in California.
Where does Butano Canyon Mutual get its water?
The primary water source is surface water.
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.
Frequently Asked Questions
What You Can Do
Test your water
Home test kits can detect lead, bacteria, and other contaminants at your tap. Find the right filter →
Check your specific ZIP code
Water quality can vary within a system. View nearest ZIP report →
Contact your utility
Butano Canyon Mutual (EPA ID: CA4100503) — request the latest Consumer Confidence Report or ask about specific contaminants.