Williamson County runs a Phase II MS4 stormwater program under a TDEC permit, protecting the Harpeth River watershed. Every development must detain excess runoff on-site so post-development flows do not exceed the natural rate.
The county Engineering Department administers stormwater under Tennessee's Phase II MS4 general permit through TDEC. Zoning Ordinance Section 7220 requires each development to detain the excess stormwater generated by new impervious surface, forest removal, or altered drainageways, with storage sized for the 1- through 100-year storm. Sites disturbing one acre or more also need coverage under the state construction general permit (TNCGP, TNR100000). The county samples the Harpeth, Little Harpeth, Owl Creek, and Rutherford Creek to track water quality.
Building without an approved stormwater plan draws a stop-work order. Illicit discharges to storm drains and unmaintained detention facilities bring correction notices and escalating fines until the site complies.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
Williamson County, TN
Williamson County has no ordinance regulating holiday lights, inflatables, or yard displays on residential property, and Tennessee has no state law on them. ...
Williamson County, TN
Yard-sale signs are allowed on private property in Williamson County, but no temporary sign may sit in or project into the public road right-of-way. Roadside...
Williamson County, TN
Williamson County's sign ordinance allows political signs on private property with the owner's permission, up to five per parcel and 30 square feet total. Si...
Williamson County, TN
Williamson County runs no rental registration or landlord licensing. There is no county registry, annual rental permit, or mandatory rental inspection, so a ...
Williamson County, TN
Tennessee has no just-cause eviction law, and Williamson County cannot add one. Under §66-28-512 a landlord ends a month-to-month tenancy with 30 days' writt...
Williamson County, TN
Rent control is illegal across Williamson County. Tennessee Code §66-35-102 bars every county and city from enacting or enforcing any ordinance controlling t...
See how Williamson County's stormwater management rules stack up against other locations.
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