Environmental Rules in Yellowstone County, MT (2026)
1 county-level rule, plus city-specific rules for 1 city in Yellowstone County, Montana.
Verified from official government sources
Note: These county rules apply to unincorporated areas of Yellowstone County. If you live within an incorporated city, that city's own rules apply: see the city list below.
Erosion Control
Yellowstone County's zoning code requires sod or another erosion control product anywhere a landscaped lawn sits in a swale, berm, or other spot prone to erosion, and it bars high-flow irrigation on steep, larger landscaped slopes unless the design adds swales, infiltration trenches, or bio-detention to stop runoff.
Landscape Erosion Control in Yellowstone County
Some RestrictionsYellowstone County Zoning Code, § 27-1208.D(7), .F(1)(c)
7. Lawn Grass Grass areas may be sodded, plugged, sprigged, or seeded, except that sod or other erosion control products shall be used in swales, berms, or other areas subject to erosion. ... (c) Irrigation systems with a precipitation rate exceeding 0.75 inches per hour shall be prohibited on areas exceeding 1,000 square feet with a slope greater than 30 percent unless: (1) Infiltration trench...
Environmental Rules by City in Yellowstone County
1 cities in Yellowstone County have their own environmental rules rules. Each link goes to that city's dedicated page with code citations.
All Yellowstone County ordinances
See every category we cover for Yellowstone County: parking, noise, fences, fires, animals, pools, and more.
Yellowstone County Ordinance Hub →