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Facilities - Dry well


Dry well Lid
Good: A typical drywell lid.
Dry well Inside
Good: A well-maintained drywell interior.

A drywell is an open-bottomed manhole used to infiltrate stormwater into the ground through holes in the walls. Drywells rely on the stormwater soaking into the surrounding soil. They trap sediment and oily pollutants in runoff, and they can fill with oily sediment in areas that lack treatment facilities. Because drywells can be clogged and tend to concentrate pollutants in one place, pollution and sediment control practices should be used to protect them. 


Confined space warning for underground facilities

Due to potential dangers, only trained and certified persons should enter confined spaces.  Confined spaces are defined as:

  • Large enough that an individual could fully enter the space and work.
  • Having limited or restricted entry or exit.
  • Not primarily designed for human occupancy.

For more information visit Washington State Department of Labor & Industries.  



Maintenance sheet

Dry well


Maintenance is needed if you see these signs

Problem with Drywell
Problem: Trash has collected inside this drywell.

Water remains in a drywell after extended dry periods

Leaves, trash and other debris slow or stop outflow or filtration.

Sediment in drywell exceeds 60% of depth below the inlet pipe

Drywell openings are clogged, reducing capacity

Evidence of oil, gasoline or other contaminants (see Report Spills)


Tips for fixing problems and general maintenance


Remove any vegetation covering the lid.


Inspection or maintenance that requires entering the underground facility can only be done by individuals trained and certified to work in hazardous confined spaces.

  • Remove trash and debris regularly.
  • Identify sources of leaks or spills and contain them as quickly as possible.
  • Remove sediment.

Check inlets and any open or confined standing water for mosquito larvae (see photos below).  If mosquitoes are a concern, contact Clark County Mosquito Control District for information. The 24-hour service request line is (360) 397-8430.

mosquito larve.jpg    mosquito larve1.jpg

Additional drywell elements

Field inlet

Field inlet

A field inlet is a concrete structure that collects stormwater and routes it through underground pipes. Fitted with a slanted, slotted grate, it often traps sediment and debris. Regular maintenance is important. Keep the opening clear of obstructions. A field inlet is usually cleaned by a truck with a  vacuum hose but sometimes can be cleaned with hand tools.


Catch Basin

CurbInlet sm sq.jpg

Also known as a storm drain or curb inlet, it can be a round structure (older) or a rectangular box (newer). It is used when connected pipes are less than 18 inches in diameter. The depth from the grate to the bottom of the pipe is usually less than 5 feet.


Report Spills

Chemical spills such as oil, gasoline, paint or herbicides/pesticides may cause harm to surface or groundwater.  Spills MUST be reported to the Washington State Department of Ecology and your local city or county.  DO NOT attempt to rinse away the spill until it's been checked.  

Washington Department of Ecology 24-hour Spill Response Number: (360) 407-6300