Environmental Rules in Modesto, CA (2026)
3 verified environmental rules for Modesto, California, sourced directly from the municipal code and official government pages.
Verified from official government sources
Erosion Control
Modesto requires a grading permit before any excavation, fill, clearing, or stockpiling on new development. Projects of 1 acre or more must file an NPDES Notice of Intent and submit a Stormwater Pollution Prevention Plan; smaller projects still need an Erosion and Sediment Control Plan.
Grading Permit Required; Erosion Control Plan Mandatory for All Land Disturbance
Heavy RestrictionsFlood Zones
Modesto has significant FEMA flood zones along the Tuolumne River and Dry Creek. Properties in Special Flood Hazard Areas (Zone A/AE) require flood insurance and must comply with floodplain development regulations. Modesto participates in the National Flood Insurance Program (NFIP).
Modesto Flood Zone Regulations
Heavy RestrictionsGrading & Drainage
Modesto requires a grading permit before any cut, fill, clearing, or grubbing activity. Projects of one-half acre or more must file a state Notice of Intent; projects of one acre or more must also submit a Stormwater Pollution Prevention Plan (SWPPP).