Athens-Clarke County (ACC) has 127,000 residents, and 98% of them rely on the ACC Public Utilities Department to provide them with clean drinking water at the turn of the tap. Water is necessary for all living things, especially humans, who are made up of 60% water. Where does our drinking water come from, and how is it cleaned?
Our drinking water comes from three sources: the North Oconee River, the Middle Oconee River, and the Bear Creek Reservoir. The North Oconee River flows through downtown along the Greenway and Dudley Park, while the Middle Oconee River can be seen by Ben Burton Park and the State Botanical Gardens. Bear Creek Reservoir is towards the northwest county line, near Burney-Harris-Lyons Middle School. This reservoir can hold 5 billion gallons of water, and we share it with Jackson, Barrow, and Oconee counties. On a typical day, we pull water from the rivers. However, during drought or high rainfall, we pull from Bear Creek to give our rivers a chance to recover.
The Rock Hill Quarry will be another drinking water source, expected to be completed in 2034. The quarry can hold about 4.5 billion gallons of water, similar to Bear Creek’s 5 billion gallons. The quarry will meet our citizens’ water needs for the next 100 years!
Five minutes from Downtown Athens is the J.G. Beacham Water Treatment Plant, which opened in 1935. This is the sole water treatment plant for all of Athens-Clarke County and can treat up to 36 MILLION gallons of water a day. But, on a typical day, the plant treats about 1/3 of that, around 12.5 million gallons. This is because it was built with future growth of the county in mind, and it allows us to rotate equipment for routine maintenance.
Water from the three sources travels through large pipes to the plant, where this raw untreated water begins the cleaning process. The raw water flows to the first stop on its treatment journey: The Rapid Mix Chamber.
Inside the Rapid Mix Chamber, the raw water mixes with activated carbon and alum. The Rapid Mix chamber is 15 feet deep with a mixer in the middle, like a giant blender, whipping everything together. Granular activated carbon removes bad odors, tastes, organic matter, parasites, viruses, and algal toxins from the water. Aluminum sulfate (alum) acts as a coagulant that sticks dirt particles together. The alum (not short for aluminum foil) is a positively charged salt. Dirt particles are negatively charged, which means they are attracted to the alum, creating floc. Alum is also used for making pickles, playdoh, and deodorant, and you can find it in the grocery store!
Next the water moves on to the Flocculation Chamber. Not only is flocculation fun to say, but also the chemicals are doing their jobs and creating floc. Floc is a group of collected dirt particles. The water then flows into the Sedimentation Basin, where everything ssssssllllllllooooooowwwwwwsssss ddddooooooowwwwwwnnnnnn. The water stays super still for about 4 hours, which allows the heavy floc to sink to the bottom of the basin and be removed from the process. The cleanest of the water moves on to the next step on the journey: Filtration.
Through Continuous Gravity Filtration, the water moves through 36 inches of sand and a very hard coal called anthracite, which removes any remaining floc and even some bacteria.
The treatment plant has two Clear Wells, each of which can hold 3.5 million gallons of water for 7 million gallons on site. Athens uses about 12.5 million gallons a day, so both Clear Wells fill and empty twice a day to provide for ACC residents. Right before entering the Clear Wells, the water gets a sort of spa treatment. We add lime, fluoride, sodium hypochlorite, and phosphate. Each of these chemicals has a really important job. The lime (not the fruit) balances the pH of the water, making it clear and improving the flavor. The fluoride helps keep our teeth strong, and the phosphate keeps the pipes that carry the water from corroding. We make sodium hypochlorite ourselves at the plant by creating a brine solution with literal TONS of saltwater that passes through an electrical current. The sodium hypochlorite helps prevent the growth of algae and other infectants while it’s traveling through the pipes.
Now the water is ready to drink! It is transported from the plant through 800 miles of pipes to homes and businesses all across Athens-Clarke County. We also have Water Operators working on site 24 hours a day, 7 days a week, 365 days a year, to test the water at all different stages in our laboratory. They test for pH, turbidity, hardness, alkalinity, ammonia, fluoride, and more. We do this to ensure that our water meets the quality standards set by the Georgia Environmental Protection Division and the United States Environmental Protection Agency. These test results are then compiled and sent out every year in the Drinking Water Quality Report for all ACC residents to see.
Next time you turn on the tap, recall this process that water went through to get from the river to you! Whenever you can, try and conserve water by limiting yourself to a five-minute shower, turning off the lights when you leave a room, and even switching to WaterSense labeled products. You can always swing by the Water Conservation Office to learn more and take home some water-saving goodies! Happy Drinking Water Awareness Week!