Grading permit required when excavating, filling, or regrading alters drainage on your property. Lots must drain toward streets or approved swales — not onto neighbors. Retaining walls over 4 ft require a building permit and engineered plans.
WP Zoning Ordinance and Building Code provisions prohibit altering grade in a manner that diverts surface water onto adjoining properties. New construction site plans must show existing and proposed grades, spot elevations, and drainage patterns. Impervious surface limits (typically 40-50% in residential districts depending on zone) apply. Sump pump and foundation drain discharges to the street via piped outlet are regulated.
Unauthorized grade changes causing neighbor drainage issues: civil penalties, mandatory restoration, and potential private nuisance suits.
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