Maine Statewide Rule

Maine state law: Grading & Drainage — MUBEC + 38 MRS § 420-C + § 420-D

Some RestrictionsApplies statewide across Maine (2026)

Maine has no single statewide grading code. Site grading and drainage on private property are governed by the Maine Uniform Building and Energy Code (25 MRS § 2451 / IRC § R401 site grading) for residential building lots, the Erosion and Sedimentation Control Law (38 MRS § 420-C) on every disturbance, and the Storm Water Management Law (38 MRS § 420-D) for projects over 1 acre of disturbance. Local CEOs administer grading permits under municipal ordinances adopted under 30-A MRS § 4352.

Key Facts

Statutory Building Code: 25 MRS § 2451 (MUBEC)
IRC Grading Standard: IRC § R401.3 (6 in / 10 ft fall)
Erosion Standard: 38 MRS § 420-C
Stormwater Trigger: 1 acre (38 MRS § 420-D)
Subdivision Drainage: 30-A MRS § 4404
Local Grading Ordinance: 30-A MRS § 4352 (home rule)

Last verified: 2026-06-02

Full Breakdown

Maine state law does not codify a free-standing 'grading ordinance' equivalent to California, Arizona, or Florida grading codes. Three overlapping statewide rules govern grading and drainage: (1) The Maine Uniform Building and Energy Code (MUBEC), adopted statewide under 25 MRS § 2451 and mandatorily enforced in municipalities of 4,000+ population, incorporates the International Residential Code (IRC). IRC Section R401.3 requires lots to be graded to drain surface water away from foundation walls (a 6-inch minimum fall within the first 10 feet, or equivalent design). (2) 38 MRS § 420-C (Erosion and sedimentation control) requires every person performing earthwork to prevent unreasonable erosion and sediment movement off-site. (3) 38 MRS § 420-D (Storm water management) requires Maine DEP permitting for projects over 1 acre of disturbance with quantity and quality runoff standards under 06-096 CMR Chapter 500. Drainage easements between adjoining landowners are governed by common law (the natural-flow rule, modified by reasonable-use doctrine) and by recorded subdivision plats under 30-A MRS Chapter 187, Subchapter IV (Subdivisions). Municipal subdivision review under 30-A § 4404 specifically requires findings on adequate drainage and erosion control as conditions of approval. Beyond MUBEC R401.3, municipal grading ordinances (where adopted under 30-A § 4352 home-rule zoning power) typically address cut-and-fill volumes, retaining-wall heights, slope-stability review, and notice-to-neighbor procedures. Inside the Shoreland Zone, 38 MRS § 439-A constrains earthwork within the 75-foot buffer.

Violations & Penalties

MUBEC site-grading violations are enforced by the municipal code-enforcement officer through stop-work orders and refusal of certificate of occupancy. 38 MRS § 420-C / § 420-D erosion and stormwater violations are enforced by Maine DEP and certified municipal CEOs, with civil penalties up to $25,000 per day under 38 MRS § 349 plus restoration orders. Private-party drainage disputes proceed as nuisance, trespass, or negligence actions in Maine Superior Court.

Frequently Asked Questions

Does Maine have a statewide grading permit requirement?

No. Maine state law does not require a separate grading permit. Site grading on residential building lots is governed by MUBEC (25 MRS § 2451) through IRC Section R401.3 (drain water away from foundations, minimum 6-inch fall within 10 feet). Earthwork must also satisfy the erosion-control standard of 38 MRS § 420-C, and projects over 1 acre of disturbance need a stormwater permit under 38 MRS § 420-D.

Can my neighbor redirect drainage onto my property?

Maine follows a modified natural-flow rule for surface water: a landowner cannot unreasonably interfere with or redirect surface drainage to the harm of neighbors. Private remedies are common-law nuisance, trespass, and negligence actions in Maine Superior Court. Recorded drainage easements on subdivision plats under 30-A § 4404 are also enforceable. There is no statewide administrative agency for drainage disputes.

Are subdivisions reviewed for drainage in Maine?

Yes. Per 30-A MRS § 4404 (Subdivision review criteria), the municipal Planning Board must make affirmative findings that the subdivision will not cause unreasonable soil erosion or stormwater runoff, that storm and surface water will be adequately handled, and that water and sewer service is adequate. Failure to make these findings is grounds to deny subdivision approval.

Sources

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