Porterville, CA Environmental Rules: Erosion Control (2026)

Porterville Municipal Code Section 407.03(J) conditions every approved tentative, final, or parcel map on compliance with grading and erosion control requirements set out in the most recently adopted edition of the California Building Code, specifically targeting the prevention of sedimentation or damage to off-site property during and after construction. This sits within the Design and Construction Standards article of the city's Subdivision Series, alongside street, drainage, and utility standards that apply to the same map approvals. Because Porterville sits at the foot of the Sierra Nevada with steep terrain on the city's east side, the code recognizes that a single mass grading plan for an entire subdivision is not always workable.

The Engineering and Project Management Director has discretion to allow individual lot grading plans, submitted with each building permit, in lieu of the mass grading plan that would normally accompany the subdivision's improvement plans. Separately, Section 407.03(L) requires every approved map to comply with the city's Storm Water Management Plan, covering measures that control both construction-site runoff and post-construction runoff, so a builder working through plan check will typically face both the grading/erosion condition and the stormwater condition on the same project. Compliance is verified by Community Development and Engineering staff before improvement plans and building permits are released, and failure to grade or control erosion as conditioned can hold up final map recordation or permit issuance.