If the water quality fails, they get a red mark, which means the E. coli levels are above the EPA single sample standard.
A green mark means the water has low and safe levels of E. coli.
They test the water themselves.
Officials with the Pearl River Valley Water Supply District say they also test the water and got safe levels of E. coli last week and this week.
They send their water off to the state to be tested and say they've never got consistent high levels of E. coli.
"The reason we're testing for E. coli is because it can cause illnesses such as diarrhea, stomach pains, swimmers ear but it also can be an indicator of bacteria for other more serious bacteria that can cause more serious illnesses in your water," said Braman.
To prevent E. coli illness after swimming in the reservoir or any freshwater system, it's always a good idea to rinse off or shower afterward.
If you have any cuts or scrapes, always treat them with hydrogen peroxide to prevent the spread of bacteria.