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Pasco, WA Environmental Rules: Stormwater Management (2026)

Some Restrictions
Compiled from the official code textEditor Martyn O'NeillLast verified September 2026

Key Facts

Single-family rate
$6.85 per month
Largest commercial rate
$34.25 per month (16+ vehicles)
Construction permit fee
$25.00
Runoff to City system charge
$135.11 per acre
Design standard
Ecology Stormwater Manual, E. Washington
Appeal path
Written petition to Public Works Director

Summary

Pasco runs a storm water management utility under Chapter 13.80 PMC that charges monthly fees by parcel type, from $6.85 for a single-family home to $34.25 for large commercial parking lots. Illicit discharges and illicit connections to the storm drain system are prohibited outright.

(1) The construction, use, maintenance, or continued existence of illicit connections to the stormwater drainage system is prohibited. (2) This prohibition expressly includes, without limitation, illicit connections made in the past, regardless of whether the connection was permissible under law or practice applicable or prevailing at the time of connection. (3) A person is considered to be in violation of this section if the person connects a line conveying sewage to the Municipal Separate Storm Sewer System (MS4), or allows such a connection to continue.

View official code

Official source re-checked September 8, 2026: no newer edition of the code had been published (publisher’s edition: current through Ordinance 4837, passed May 4, 2026).

Full Breakdown

010 as part of the water/sewer utility, administered by the Director of Public Works. 85, and undeveloped parcels pay nothing. 78 per acre for state highway right-of-way runoff. 080, and the Director's decision is final. 090. 190. 0) and controlled construction site water, subject to volumetric and pollution controls.

Violations & Fines

PMC 13.80.140 prohibits the construction, use, maintenance, or continued existence of any illicit connection to the storm water drainage system, including connections made in the past regardless of whether they were lawful when made. A person is in violation if they connect a sewage line to the Municipal Separate Storm Sewer System (MS4) or allow such a connection to continue. PMC 13.80.110 separately bars illicit discharges as defined by the Washington State Department of Ecology from entering any storm drain system, and swimming pool or spa discharges that are not dechlorinated and pH-adjusted under PMC 13.80.120 are barred from the MS4 entirely.

Frequently Asked Questions

How much is Pasco's storm water utility fee for a house?
PMC 13.80.070, priced in the fee schedule at PMC 3.35.200, charges single-family residential parcels $6.85 per month for storm water management, while undeveloped parcels pay nothing and vacant buildings still pay $6.85 per month.
Can a property owner dispute their storm water charge?
Yes. PMC 13.80.080 lets any customer or property owner who believes their drainage service charge was incorrectly computed or applied petition the Director of Public Works in writing for a review, and the Director's decision on that review is final.
Is dumping pool water into a storm drain legal in Pasco?
Only if it meets the conditions in PMC 13.80.120: swimming pool, spa, and hot tub discharges must be dechlorinated to 0.1 ppm or less, pH-adjusted between 6.0 and 9.0, and controlled to prevent sediment resuspension and temperature increases. Pool filter backwash may never be discharged to the storm sewer system.
What is an illicit connection under Pasco's storm water code?
PMC 13.80.140 defines it as any construction, use, or continued existence of a connection to the storm drainage system that is not stormwater, including a sewage line tied into the Municipal Separate Storm Sewer System. This is prohibited even if the connection was made legally in the past.

Sources & Official References

Other rules in Pasco

Parking Rules: Overnight ParkingSome RestrictionsParking Rules: RV & Boat ParkingSome RestrictionsFlood ZonesSome RestrictionsBoat Dock PermitsSignificant RestrictionsErosion ControlLight RestrictionsFlood Elevation RequirementsSome RestrictionsNoise Ordinances: Decibel LimitsSome RestrictionsParking Rules: Abandoned VehiclesSignificant RestrictionsParking Rules: Driveway RulesSome RestrictionsFence Regulations: Fence Permit RequirementsLight Restrictions

All Pasco rules

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