Vancouver, Washington is one of the fastest-growing cities in the Pacific Northwest — and its water system is grappling with PFAS contamination, groundwater nitrate, and the pressures of rapid development. Sitting across the Columbia River from Portland, Vancouver has its own distinct water challenges.
Where Vancouver Gets Its Water
The City of Vancouver and Clark Public Utilities serve the metro area’s roughly 200,000 residents from a combination of groundwater wells and surface water. Clark Public Utilities — the larger provider — draws from the Lewis River as well as local wells. The City of Vancouver has historically relied on groundwater from the Troutdale aquifer and other formations.
This dual-source approach gives Vancouver flexibility, but each source comes with its own vulnerabilities. Groundwater faces contamination from surface activities. Surface water from the Columbia and Lewis rivers carries agricultural, industrial, and urban pollutants from vast upstream watersheds.
PFAS: A Documented Problem
PFAS contamination in the Vancouver area has been well-documented. Key sources include:
Pearson Field/Vancouver Barracks — The former military installation in central Vancouver used AFFF for firefighting, and PFAS has been detected in groundwater near the site. The barracks area is part of the Fort Vancouver National Historic Site, and contamination has raised concerns about wells and nearby properties. [NEEDS VERIFICATION: current PFAS levels at Pearson Field and remediation status]
Portland Air National Guard Base — Located at Portland International Airport just across the river, this facility’s PFAS contamination affects the broader groundwater system that doesn’t respect state lines.
Industrial sources — Various manufacturing and industrial operations in Clark County have used PFAS-containing materials, contributing to the regional contamination picture.
The Washington Department of Ecology has been actively investigating PFAS contamination across the state, and Clark County has been a focus area. Some private wells have tested above state action levels for PFAS, and affected residents have been advised to use alternative water sources or install treatment systems.
Clark Public Utilities and the City of Vancouver have conducted PFAS testing of their water supplies. As the EPA’s 2024 PFAS MCLs take effect, compliance will require ongoing monitoring and potentially treatment upgrades. [NEEDS VERIFICATION: most recent PFAS test results from both utilities]
Groundwater Nitrate: Agriculture Meets Suburbia
Clark County’s transition from agricultural to suburban land use has created a nitrate contamination problem in some groundwater areas. Decades of farming — with associated fertilizer and animal waste application — loaded nitrate into shallow aquifers. As development replaced farms, the contamination remained, and septic systems in some areas added to the problem.
The Washington Department of Health has designated portions of Clark County as nitrate priority areas. Some wells in the county have tested above the EPA’s MCL of 10 mg/L for nitrate, particularly in areas with shallow wells and permeable soils. [NEEDS VERIFICATION: current number of wells exceeding nitrate MCL in Clark County]
Nitrate contamination is particularly concerning for families with infants. Elevated nitrate in drinking water can cause methemoglobinemia — a condition that reduces the blood’s ability to carry oxygen. The standard advice is that water with nitrate above 10 mg/L should not be used for infant formula or drinking.
Public water systems treat for nitrate when necessary, but private well users are on their own for testing and treatment.
The Columbia River: Shared Resource, Shared Risks
The Columbia River is one of North America’s great waterways, and it carries the accumulated impacts of its enormous watershed. While Vancouver doesn’t currently draw drinking water directly from the Columbia, the river’s health affects the region’s groundwater, ecology, and any future water supply planning.
Contaminants in the Columbia include:
- Legacy pollutants from upstream Superfund sites, including the Hanford Nuclear Reservation
- Agricultural chemicals from the vast irrigated farmlands of eastern Washington and Oregon
- Mercury from both natural sources and historical mining
- Temperature — the river runs warmer than historical norms, affecting salmon habitat and water chemistry
- Microplastics and pharmaceuticals from urban runoff and wastewater discharge
Portland Harbor, just downstream from Vancouver on the Oregon side, is a Superfund site with significant sediment contamination from decades of industrial activity. While this doesn’t directly affect Vancouver’s drinking water, it speaks to the industrial legacy of the shared metro area.
Rapid Growth and Infrastructure Strain
Clark County has been one of the fastest-growing counties in Washington for years. People are moving from Portland for lower housing costs and no state income tax, and the population surge puts pressure on water infrastructure.
More development means:
- More impervious surface generating stormwater runoff
- More wells competing for the same aquifers in unincorporated areas
- More demand on treatment capacity for public water systems
- More septic systems in areas not yet connected to sewer
Clark Public Utilities has been investing in system capacity and new water sources, but growth consistently runs ahead of infrastructure. New subdivisions need water, and the geology determines where you can drill productive wells.
The interplay between growth and water quality isn’t abstract here — it’s measured in nitrate levels, aquifer drawdown, and treatment plant capacity.
What the Data Shows
Both Clark Public Utilities and the City of Vancouver publish annual water quality reports showing compliance with federal standards. Key parameters:
- Lead and copper — below action levels in both systems
- Nitrates — monitored closely; treated when necessary in public supplies
- Disinfection byproducts — managed through treatment process optimization
- PFAS — testing ongoing; a critical metric as new MCLs take effect
- Turbidity — well-managed in groundwater sources; surface water intake requires more active treatment
For private well users in Clark County, the picture is less rosy. Without mandatory testing requirements, many homeowners don’t know what’s in their water until they test — or until they get sick.
What Vancouver Area Residents Should Do
Test your private well. If you’re on a well in Clark County, test for nitrates, bacteria, PFAS, and any contaminants specific to your area. The Clark County Public Health Department provides guidance on testing labs and what to look for.
Know which utility serves you. Clark Public Utilities and the City of Vancouver are separate systems with different sources and different water quality profiles. Review the correct report for your address.
If you’re near a known PFAS site, check the Department of Ecology’s cleanup site database. You may be eligible for free water testing or alternative water supply if contamination has reached your well.
Install appropriate filtration. Reverse osmosis handles the broadest range of contaminants — nitrate, PFAS, lead, disinfection byproducts. Carbon filters work well for taste, chlorine, and some organic compounds but don’t remove nitrate.
New homeowners: test before you trust. If you’re buying a home with a private well, get a comprehensive water test before closing. Don’t assume the seller’s old test results are still accurate.
Conserve water. In a region where aquifers are under increasing demand, conservation helps maintain both water quantity and quality. Less pumping means less drawdown and less chance of pulling contaminants from adjacent areas.
If you’re concerned about your water quality, a certified water treatment professional can test your water and advise on solutions.