Environmental Rules in Billings, MT: What Residents Actually Need to Know
If you live in Billings or are thinking about moving there, environmental rules are one of those things you probably won't think about until they affect you directly. Billings has 4 specific rules on the books covering different aspects of environmental rules, and some of them might surprise you.
Stormwater Management
Billings operates an MS4 stormwater system under EPA NPDES Phase II permit. Property owners cannot discharge non-stormwater pollutants to streets, gutters, ditches, or storm drains feeding the Yellowstone River.
Key details: MS4 permit type: EPA NPDES Phase II. SWPPP threshold: Land disturbance over 1 acre. Receiving water: Yellowstone River. BMC chapter: Chapter 31 utilities.
Illicit discharges and illegal connections draw notices, daily civil penalties, and recovery of cleanup costs. Repeat industrial offenders risk EPA referral.
Erosion Control
Construction on the Billings Rims, Sacrifice Cliff terraces, and steep draws above the Yellowstone Valley must install erosion controls before grading to keep sediment out of storm drains and waterways.
Key details: DEQ permit threshold: 1 acre disturbance. Required BMP: Perimeter silt fence. Stabilization timing: Before final inspection. Common Rims soil: Erodible sandy loam.
Failure to install or maintain erosion controls leads to stop-work orders, daily fines, and required restoration of silted neighboring properties or drainages.
Flood Zones
Billings regulates construction within the FEMA-mapped Yellowstone River floodplain through floodplain permits, elevation requirements, and prohibitions on fill or structures that increase flood heights downstream.
Key details: Elevation above BFE: 1 foot minimum. Substantial improvement threshold: 50 percent of value. Floodway fill: Generally prohibited. Permit authority: Public Works floodplain admin.
Unpermitted floodplain construction triggers stop-work orders, mandatory removal, and loss of NFIP flood insurance eligibility for the structure.
This is not one of those rules that cities tend to ignore. Billings actively enforces its flood zones requirements.
Vehicle Idling Restrictions
Montana has no statewide diesel anti-idling rule, and Billings does not impose a general idling ban. Air quality near the ExxonMobil refinery, CHS Laurel, and rail yards is monitored under federal Clean Air Act standards.
Key details: City idling ban: None. Refinery permits: Title V Clean Air Act. State agency: Montana DEQ Air Quality. Refinery locations: Lockwood, Laurel.
Local idling enforcement is minimal. Violations of state air permits at refineries can trigger DEQ enforcement actions and federal EPA penalties under the Clean Air Act.
Billings is more permissive than most cities when it comes to vehicle idling restrictions. That said, there are still limits.
The Bottom Line
Billings's environmental rules rules are a mixed bag. Some areas are strict, others are relaxed, and the details matter. The best approach is to check the specific rule that applies to your situation rather than assuming Billings is broadly strict or permissive.
Keep in mind that Billings can amend these rules at any council meeting. For the most current version of any rule mentioned here, check the specific ordinance page, where we track updates as they happen.