constructionlegalengineering
What drainage permits does a splash pad need?
Quick answer
Most jurisdictions require a stormwater management permit (often via the local MS4 program), a sanitary-sewer discharge permit if water flows to the sewer, and sometimes a NPDES construction permit for sites disturbing over 1 acre. Total permit cost runs $500-5,000 depending on city.
Splash pad drainage typically falls under three permit umbrellas. First, a stormwater management permit issued by the local MS4 (Municipal Separate Storm Sewer System) reviewer ensures the pad's runoff and any reuse system meets quality and quantity standards. Second, sanitary-sewer discharge permits cover flow-through pads that send water to the sanitary sewer — local utilities often charge a connection fee plus per-1,000-gallon discharge rates. Third, sites disturbing over 1 acre during construction need a NPDES construction stormwater permit with an erosion and sediment control plan. Some jurisdictions add a fats-oils-grease permit for any deck drains near food service. Total permit budget: $500-5,000 plus engineer time to prepare the SWPPP. Skipping permits is a fast track to a stop-work order and fines that can double the project cost. Pull permits early — review cycles run 4-12 weeks.