Stanwood sits at the intersection of two counties and two very different geological zones. From the elevated Cedarhome Plateau to the fertile Stillaguamish River flats and coastal areas near Port Susan, groundwater conditions vary dramatically within just a few miles.

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At Access Well Drilling & Pumps, we design well systems specifically for Stanwood’s upland glacial formations and lowland alluvial soils — ensuring reliable production, long-term stability, and compliance with Washington State and local health regulations.

1. Water Regulations & Basin Considerations

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Stanwood properties may fall under Snohomish County Health District jurisdiction, and depending on parcel location, may also be influenced by watershed-level water availability rules tied to:

• WRIA 5 (Stillaguamish Basin)

• WRIA 3 (Skagit Basin – northern areas)

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Water availability and mitigation requirements are parcel-specific. Some properties may require documentation demonstrating legal water supply before building permits are approved.

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We assist property owners by:

• Reviewing basin designation

• Evaluating mitigation status (if applicable)

• Filing required Notice of Intent (NOI) with the Department of Ecology

• Coordinating well siting to meet county setback standards​

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2. Required Construction Procedures​

72-Hour Notice of Intent

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Washington State law requires a Notice of Intent (NOI) to be filed with the Department of Ecology at least 72 hours before drilling begins. We handle this process as part of our standard service.

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Setbacks & Siting

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Typical well setbacks include:

• 100 feet from septic drainfields

• 50 feet from septic tanks

• 5 feet from property lines

• Additional distances from contamination sources depending on site conditions
   

Proper siting is especially important on smaller lots or in dense rural developments.

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3. Stanwood Geology: Two Very Different Worlds

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The Cedarhome Plateau & Upland Areas:

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The uplands are dominated by Vashon Glacial Till — a dense mixture of clay, sand, and gravel left by retreating glaciers. This formation can be difficult to drill through but often protects deeper aquifers below.

Common upland characteristics:

• 50–70 feet (or more) of glacial till “cap”

• Deeper confined aquifers beneath

• Greater static water depth compared to valley floor
   

Wells in these areas often range from 200–350 feet depending on formation and yield goals.

The Stillaguamish Flats & Valley Floor

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Lower elevations consist of river-deposited silts, sands, and gravel.

These wells often:

• Encounter shallower groundwater

• Require precision well screen design

• Need thorough development to prevent sand production
   

Typical depths in the flats range from 80–150 feet, though site conditions vary.

Coastal & Marine Influence Areas

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Near Port Susan or other shoreline-adjacent areas, groundwater development requires careful depth targeting and pump sizing to reduce the risk of saltwater intrusion.

In these locations, we may recommend:

• Conservative pump rates

• Chloride or conductivity testing

• Periodic water quality monitoring
   

Not all coastal-adjacent wells experience salinity issues, but proactive planning protects long-term water quality.

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4. Common Stanwood Water Quality Considerations

Hard Water

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Stanwood groundwater frequently contains elevated calcium and magnesium. Water softening systems can help prevent scale buildup in plumbing and appliances.

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Iron & Manganese

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Iron staining is common in both upland and lowland wells. Filtration systems can effectively remove discoloration and metallic taste.

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Arsenic

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Naturally occurring arsenic can be present in some Puget Sound lowland wells. Periodic testing is recommended. If elevated levels are detected, certified adsorption or Reverse Osmosis (RO) systems can reduce concentrations below the 10 ppb drinking water standard.

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Sand & Silt Management:

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In floodplain and delta soils, proper screen selection and air-surging during development are critical to prevent “sanding-in” and premature pump failure.

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5. Typical Stanwood Well Metrics

While each property is unique, common ranges include:

Upland Wells (Plateau Areas):

• Depth: 200–350 feet

• Static water level: Often deeper due to elevation
   

Valley / Flats Wells:

• Depth: 80–150 feet

• Static water level: Often 10–40 feet below surface

Yield Expectations:

• Many residential wells produce 15–30+ GPM

Sustainable yield is prioritized, especially in coastal-adjacent zones​​​