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On September 20, 2019, LDEQ finalized amendments to the Water Quality regulations through two separate actions. The finalized rules, WQ101 and WQ103, have no changes from the June 20, 2019 proposed rules. Facilities that hold LPDES permits to discharge into subsegments 050603, 090205, and 090206 should be aware of these changes. Following is a summary of changes to WQ101 and WQ103.

WQ101 amends LAC 33:IX.1123, Table 3. The rule classifies subsegment 050603 (Bayou Chene from headwaters to Lacassine Bayou, including Bayou Grand Marais) as naturally dystrophic waters with a seasonal dissolved oxygen criteria of five milligrams per liter (mg/L) during the months of December through February, and three mg/L during the months of March through November.

WQ103 amends LAC 33:IX.1113.B.9.b.iii to revise the turbidity criteria for two subsegments in the Pearl River Basin. The turbidity criteria for subsegment 090205 (Wilson Slough) and subsegment 090206 (Bradley Slough) are revised from 25 nephelometric turbidity units (NTU) to a turbidity criteria of 50 NTU.

If you have any questions regarding the final rules, please contact Elizabeth Byers at or Jeanne-Marie Heintz at, or contact Trinity's Baton Rouge office at (225) 346-4003.