Seen Saturday near old Pine Grove School.
NPDES is

National Pollutant Discharge Elimination System:

Water pollution degrades surface waters making them unsafe for
drinking, fishing, swimming, and other activities. As authorized by
the Clean Water Act, the National Pollutant Discharge Elimination
System (NPDES) permit program controls water pollution by regulating
point sources that discharge pollutants into waters of the United
States. Point sources are discrete conveyances such as pipes or
man-made ditches. Individual homes that are connected to a municipal
system, use a septic system, or do not have a surface discharge do
not need an NPDES permit; however, industrial, municipal, and other
facilities must obtain permits if their discharges go directly to
surface waters. In most cases, the NPDES permit program is
administered by

authorized states.
Since its introduction in 1972, the NPDES permit program is
responsible for significant improvements to our Nation’s water
quality.

Yes, I know Valdosta also does this.
I like it that in a subdivision in an unincorporated part of Lowndes County
that the county does this.

-jsq