<P> There are over 16,000 POTWs in the U.S. , serving 75 percent of the total population . The remainder of the population is served by decentralized or private septic systems . The POTWs treat 32 billion US gallons ( 120 gigalitres ) of wastewater every day . Most POTWs are required to meet national secondary treatment standards . </P>
<P> There are over 16,000 POTWs in the U.S. , serving 75 percent of the total population . The remainder of the population is served by decentralized or private septic systems . The POTWs treat 32 billion US gallons ( 120 gigalitres ) of wastewater every day . Most POTWs are required to meet national secondary treatment standards . </P>
how many wastewater treatment plants are there in the us
how many wastewater treatment plants are there in the us
over 16,000
over 16,000