Data: EPA ECHO, Census ACS, NTSB Last verified:

What is the infrastructure stress indicator?

The infrastructure stress indicator is a heuristic 0-100 composite of housing age, state funding need, violation history, and lead evidence. It is not a probability, measured pipe condition, or forecast of breaks, pressure loss, or contamination. Vashon's average indicator is 38/100.

What are CO/gas incidents?

Carbon monoxide (CO) and gas incidents tracked by the NTSB include pipeline failures, gas leaks, and CO exposure events. CO is odorless and can be fatal - the CDC reports about 420 deaths annually from unintentional CO poisoning. Every home should have working CO detectors on each floor, tested monthly. Vashon has 15 recorded incidents in the NTSB database.

Infrastructure Risk Distribution

Vashon is covered by a single ZIP code. Its infrastructure risk level:

Low 0 ZIPs

Moderate 1 ZIP

High 0 ZIPs

Very High 0 ZIPs

Infrastructure Risk Overview

Vashon, Washington has a moderate modeled infrastructure stress level with an average heuristic indicator of 38/100. The result summarizes model inputs and does not predict service outcomes.

The infrastructure stress indicator combines source inputs for housing age, funding need, violation history, and lead evidence. It does not measure the likelihood of pipe failure, water-main breaks, or system degradation.

Key Infrastructure Metrics

Metric	Value
Stress indicator	38/100
Modeled stress level	moderate
Water systems	5
Median build year	1975
Pre-1986 housing	68%
CO/gas incidents	15
ZIP codes	1
Population	10,424

Infrastructure Risk Distribution

How Vashon's 1 ZIP code is distributed by infrastructure risk level:

Water System Age and Pipe Materials

The median home in Vashon was built in 1975 (approximately 51 years old). Housing age is one of the strongest proxies for water infrastructure age, as service lines and interior plumbing were typically installed during construction.

Pipe material risks by era:

With 68% of Vashon's homes built before 1986, a significant portion of residential plumbing may contain lead solder or aging pipe materials.

Carbon Monoxide & Gas Safety

15 CO/gas incidents have been recorded in the county covering Vashon. The average CO risk score is 10 out of 100.

Carbon monoxide is odorless and colorless - it is the leading cause of poisoning deaths in the U.S. Risk factors include:

• Gas furnaces, water heaters, and stoves
• Attached garages
• Blocked chimneys or vents
• Portable generators used indoors

Prevention:

• Install CO detectors on every level, especially near bedrooms
• Have gas appliances inspected annually
• Never run generators, grills, or cars in enclosed spaces
• Replace CO detectors every 5-7 years

What Homeowners Can Do

Pipe Inspection

• Hire a licensed plumber to inspect your service line and interior plumbing
• Check for discolored water (brown/orange = rust; white/cloudy = air or sediment)
• Test water pressure - low pressure may indicate buildup in aging pipes
• Look for visible corrosion on exposed pipes in basement or utility areas

Water Heater Maintenance

• Flush your water heater annually to remove sediment
• Check the anode rod every 2-3 years (prevents tank corrosion)
• Set temperature to 120F to prevent scalding and reduce energy use
• Replace water heaters older than 10-15 years proactively

CO Detector Placement

• One detector per floor, minimum
• Within 10 feet of each bedroom door
• Near attached garage and utility room
• 5 feet above the floor (CO rises with warm air) or on the ceiling
• Not near windows, doors, or HVAC vents (air movement causes false readings)

Vashon vs. Nearby Washington Cities

How Vashon's infrastructure compares to nearby cities:

ZIP Codes in Vashon

Vashon covers 1 ZIP code served by 5 water systems. Infrastructure condition varies by ZIP code based on housing age, pipe material, and water system maintenance. Check your specific ZIP code for localized data.

Data Sources

• Water systems: EPA ECHO - Enforcement and Compliance History Online
• Infrastructure risk: Derived model (housing age, violation history, system assessments)
• Housing age: U.S. Census Bureau American Community Survey (ACS)
• CO/gas incidents: NTSB, PHMSA pipeline incident reports

Source reporting periods vary. See each cited source for its publication schedule.

Infrastructure Risk by ZIP Code in Vashon

Vashon is covered by a single ZIP code, so one infrastructure profile applies citywide. Risk within it still depends on system age, pipe materials, and violation history.

ZIP Code	Grade	Score	Violations
98070	A	93/100	8	View report →