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Water Services

Water Quality Buffers

New development and significant redevelopment sites are required to preserve water quality buffers along Metro’s community waters, which include streams, rivers, springs, lakes, ponds, and wetlands. Please see Metro’s Stormwater Management Manual, Volume 1, Section 6.9 for additional information.

Metro Water Services (MWS) accepts Hydrologic Determinations performed by Qualified Hydrologic Professionals certified by TDEC. Please visit the Tennessee Hydrologic Determination Training website for additional information. MWS will also accept Hydrologic Determinations performed by qualified professionals that understand the indicators of geomorphology, hydrology, and biology used to differentiate streams from wet weather conveyances. They will need to submit the following forms:

Hydrologic Determinations should be submitted to Rebecca Dohn

Buffer Signs

graphic: Stream Buffer Sign, text:: stream buffer, do not disturb, Metro Nashville Stormwater NPDES Department, 615-880-2420Buffer signs may be purchased from a variety of sign vendors. Please make certain the company is using our approved artwork and the specifications below. If they do not have the artwork, please have them contact Rebecca Dohn @ 615-880-2420 or


  • 12" X 18" white 0.063 aluminum
  • Black and kelly green copy
  • Single sided
  • Sign to be mounted to post at top and bottom with stainless steel hardware

Post Description:

  • 6' galvanized U-channel or 4" x 4" pressure treated lumber post
  • 2' below grade
  • 4' above grade