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What is a dry well?

A dry well is a gravel-filled pit or chamber that stores roof runoff while water soaks into surrounding soil. Storage can be a shallow trench or deep well. Soil and groundwater conditions determine suitability; Annapolis’s maintenance guidance uses a 48-hour drainage check. Confirm site suitability before planning installation.

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By InstaBids editorial team with AI research agents. Updated

What this means for your home project

  1. Before planning a new stormwater drainage well, contact your permitting authority about construction requirements. Source: U.S. Environmental Protection Agency, read 2026-11-03.
  2. After rain, check the observation well for drainage; Annapolis guidance expects drainage within 48 hours. Source: City of Annapolis, Maryland, read 2026-11-03.
  3. Ask for a written layout showing the dry well and building foundations; Portland requires this relationship on plans for its closer-to-building cases. Source: City of Portland, Oregon, read 2026-11-03.
  4. Ask whether the proposed location leaves the dry well accessible for maintenance, as Portland’s location guidance requires. Source: City of Portland, Oregon, read 2026-11-03.
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How far from the house should a dry well be installed?

Check the local location rules before choosing a spot. Portland, Oregon cites OPSC Section 1101.6.3: 10 feet from buildings and 5 feet from property lines, with conditional exceptions detailed in Code Guide 17-10. These are Portland rules, rather than nationwide distances. Harford County identifies a single rooftop or downspout as a best-suited drainage area. “City of Portland Title 25.10 and the Oregon Plumbing Specialty Code (OPSC) 1101.6.3 requires that drywells be located no closer than 5’ from a property line and no closer than 10’ from a building.” Source: City of Portland, Oregon, read 2026-11-03. “The City of Portland has determined that drywells can be located closer than 5’ from a property line and/or closer than 10’ from a building without a plumbing code appeal if ALL of the following conditions are met.” Source: City of Portland, Oregon, read 2026-11-03. “Drywells can be used in both residential and commercial sites and are best suited for treating runoff from small drainage areas such as a single rooftop or downspout.” Source: Harford County, Maryland, read 2026-11-03.

How long should a dry well take to drain?

Annapolis, Maryland uses a 48-hour drainage check after rain. Soil type and groundwater level affect suitability; persistent standing water can indicate clogging that needs cleaning or replacement of gravel or piping. “Observation wells should be inspected to make sure water is draining as expected (drainage should be complete within 48 hours after rain events).” Source: City of Annapolis, Maryland, read 2026-11-03. “Successful application is dependent upon soil type and groundwater elevation.” Source: Harford County, Maryland, read 2026-11-03. “If standing water occurs for more than 48 hours, the dry well, filter fabric or underground piping may be clogged.” Source: City of Annapolis, Maryland, read 2026-11-03. “The gravel or underground piping may need to be cleaned or replaced.” Source: City of Annapolis, Maryland, read 2026-11-03.

Who is responsible for this dry well's maintenance?

Annapolis assigns maintenance to the property owner. Its maintenance sheet also calls for securing the observation cap, alongside the drainage check described above. “As the property owner, you are responsible for all maintenance of your dry well.” Source: City of Annapolis, Maryland, read 2026-11-03. “Ensure the observation well cap is securely fastened.” Source: City of Annapolis, Maryland, read 2026-11-03.

What are the minimum federal requirements for stormwater drainage wells?

For a new Class V stormwater drainage well, contact the permitting authority before construction. EPA also warns that state requirements can be stricter, so a local installation needs its own regulatory review. “If you have a new stormwater drainage well, you must contact your permitting authority before you begin construction.” Source: U.S. Environmental Protection Agency, read 2026-11-03. “Some states have applied for and been granted authority to implement the Class V UIC Program in their state, including oversight of stormwater drainage wells, and may have more stringent requirements.” Source: U.S. Environmental Protection Agency, read 2026-11-03.

Why does EPA regulate stormwater drainage wells?

EPA regulates injection to protect underground sources of drinking water, abbreviated USDWs. Runoff can carry petroleum or other organic compounds underground, making the water entering the dry well a design concern. “The Safe Drinking Water Act (SDWA) requires that EPA protect USDWs from injection activities.” Source: U.S. Environmental Protection Agency, read 2026-11-03. “Stormwater injection is a concern because storm water may contain petroleum or other organic compounds that could harm USDWs.” Source: U.S. Environmental Protection Agency, read 2026-11-03.

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