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Boise, ID Environmental Rules: Stormwater Management (2026)

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

Key Facts

Governing law
BCC § 10-6, Stormwater Management Ordinance
Enforcement
Director of Public Works
Development trigger
Building permit projects need drainage plan
Penalty
Up to $1,000 fine, 6 months jail
Design standard
City Stormwater Management Design Manual

Summary

Boise regulates stormwater discharge and requires drainage plans for new development under its Stormwater Management and Discharge Control Ordinance.

No person shall throw, deposit, leave, maintain, keep or permit to be thrown, deposited, placed, left or maintained, any refuse, rubbish, garbage or other discarded or abandoned objects, articles and accumulations, in or upon any street, alley, sidewalk, storm drain inlet, catch basin, conduit or other drainage structures, parking area, or upon any public or private plot of land so that the same might be or become a pollutant, except where such pollutant is being temporarily stored in properly contained waste receptacles or is part of a well defined compost system.

C.   Leaking Containers: No person shall cause or permit any dumpster, solid waste bin or similar container to leak such that any pollutant is discharged into any street, alley, sidewalk, storm drain, inlet, catch basin, conduit or other drainage structures, business place or upon any public or private plot of land in the City.

D.   Property Maintenance: The occupant or tenant, the owner, lessee or proprietor of any real property in the City where there is located a paved sidewalk or parking area shall maintain said paved surface free of dirt or litter to the extent reasonable and practicable and provide an adequate means for the disposal of refuse, rubbish, garbage or other articles so as to prevent such matter from entering a storm drain. Sweepings from said sidewalk shall not be swept or otherwise made or allowed to go into the gutter or roadway, but

Source: Idaho DEQ MS4 StormwaterView official code

Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: 2026 S-31: Code current through: Ord. 20-26, passed 6-9-2026).

Full Breakdown

Boise City Code Chapter 10-6 bans dumping pollutants into storm drains, gutters, or catch basins and prohibits illicit connections to the municipal storm sewer system (MS4). Industrial, commercial, and institutional developments needing a building permit, plus qualifying multi-family and subdivision projects, must submit a stormwater management plan or comprehensive drainage plan built to the City Stormwater Management Design Manual before construction. Parking lot and outdoor storage operators must follow Best Management Practices to keep runoff clean. The Director of Public Works enforces the chapter and can order inspections, sampling, and abatement.

Violations & Fines

Knowing violations are misdemeanors under § 1-4-1: fine up to $1,000, up to 6 months in jail, or both, with each day counted as a separate offense.

Frequently Asked Questions

Does my new building need a stormwater plan in Boise?
Yes, if it's industrial, commercial, institutional, qualifying multi-family, or a private-access subdivision project requiring a building permit (BCC § 10-6-3-1).
Can I dump car wash or paint water into a Boise storm drain?
No. Boise City Code § 10-6-2-1 bans discharging pollutants into storm drains, gutters, or catch basins, and illicit connections are separately prohibited under § 10-6-2-2.

Sources & Official References

Other rules in Boise

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