South Island PSD

 

Wastewater Plant

about us

Our water, which is drawn from the Floridan and Cretaceous Aquifers, is considered moderately hard. For more details about our water, please reference our annual consumer confidence report.

It is impossible to ignore how important clean, safe water is in our daily lives. We use it for so many, many things – cooking, cleaning, bathing and – most importantly – drinking. Your drinking water consistently meets or surpasses all of the water quality standards established by the Environmental Protection Agency (EPA) and South Carolina Department of Health and Environmental Control (DHEC).

We check the quality of your drinking water carefully and consistently. South Island PSD takes water samples from the groundwater wells, throughout our water system, and at water taps in homes in our service area.  Both a certified, independent lab and the South Island PSD certified lab perform tests on these water samples.  South Island PSD regularly reports test results to DHEC.  DHEC also performs sanitary surveys to check water quality on a regular basis.

We have a Reverse Osmosis Plant that provides high quality drinking water along with groundwater drawn from the aquifers that are chlorinated for disinfection before distribution to our customers.  We also store treated water underground in Aquifer Storage and Recovery (ASR) wells and recover that water when demands are high.  During the wet season, treated drinking water is pumped from the water treatment plants into the wells.  During dry months or drought, the water is pumped back out for delivery to you.  This storage system allows us to maximize existing treatment plant capacity and defer expensive water system expansions.

All Drinking water, including bottled drinking water, may be reasonably expected to contain at least small amounts of some contaminants.  In order to ensure that tap water is safe to drink, EPA prescribes regulations which limit the amount of certain contaminants in water provided by public water systems.  Food and Drug Administration (FDA) regulations establish limits for contaminants in bottled water which must provide the same protection for public health.

Some people may be more vulnerable to contaminants in drinking water than the general population. Immuno-compromised individuals, such as persons with cancer undergoing chemotherapy, persons who have undergone organ transplants, people with HIV/AIDS or other immune system disorders, some elderly people and infants can be particularly at risk from infections. If you are immuno-compromised, seek advice from your health care provider. Guidelines on reducing the risk of infection from contaminants are available from the Safe Drinking Water Hotline (1-800-426-4791).

Headworks

All raw wastewater (influent) is pumped from lift stations in our service area. The screens remove large debris and grit.

Our water is stored using a combination of a 2 Million Gallon Above Ground Storage Tank, 3 Elevated Storage Tanks (Water Towers) with a 300,000 gallon capacity each, and 2 Aquifer Storage and Recovery (ASR) Facilities that store about 300 Million Gallons.


ASR storage & recovery is a cost-effective way to store huge volumes of water using natural geologic formations beneath the earth’s surface. These two facilities allow water to be stored when demand is low, and recovered during high-demand periods. 

Equalization Basins

Flow continues from the headworks to the EQ basins, These absorb the surges in flow, keeping the operation stable.

RO Plant

Aeration Basins

These receive wastewater from the EQ system, and introduce oxygen into the bacteria to help break down the waste.

Clarifiers

The sediment tanks, or clarifiers, allow solids to settle at the bottom of the tank. The solids are pumped back into the aeration system while the outflow is considered treated.

ASR Wells

South Island Public Service District (SIPSD) serves 25,000 customers

The District provides Water & Wastewater Services from the Cross Island Bridge to Fresh Market Center. Our service area includes all four of the South-End Plantations which include Sea Pines, Wexford, Shipyard and Long Cove. Our district also encompasses Pope Avenue, Coligny, Forest Beach and Point Comfort in their entirety.


The Water System demands 6 million gallons of water.

While our daily demand averages 6 million gallons of water per day, at peak it requires 8.5 million gallons each and every day. The water is produced from a combination of:


-13 Floridan Wells (Approximately 120’ Deep)

-1 Cretaceous Well (Approximately 3,832’ Deep)

-1 Reverse Osmosis Water Treatment Plant

Generator

Incoming power is fed through switch gear, then motor controls to the equipment. In case of power loss, this 1500kw generator backs up the plant.

Water quality

south island public service district

Sludge Handling

Aerobic Digesters, holding tanks, and a centrifuge break down the sludge. Solids are then sent to a landfill while the water is fed back to the plant.

Irrigation System

Once through the filtration system, the wastewater is now called "effluent" and is ready for irrigation or discharge to wetlands.

The District’s reclaimed water system is one of a kind.

It provides reclaimed water services to 7.5 golf courses and 130 commercial customers, which equates to an average of 380 million gallons of reclaimed water sold every year.


An average of 440 million gallons of reclaimed water is pumped into our wetland restoration program each year. This program covers 105 acres in the Sea Pines Forest Preserve, restoring and maintaining the wetlands. It is the oldest natural wetland system in the entire southeast region of the United States!


Over 900 million gallons of water each year is recycled.

Our facilities are designed to treat and recycle 5 million gallons of water each day, and our current demand averages 2.5 million gallons. Our Wastewater Treatment facilities employ state of the art technologies and is the only full reclaimed water facility on South Carolina’s coast.


Always improving.

The District recently finished construction on our new solids handling facility, laboratory administration facility, and maintenance building. We've recently made other improvements to the headworks facility including new screens, grit separation, and completed construction on a dual phase odor scrubber.


See the images below for an overview of the process!

We’ve been operating our Reverse Osmosis (RO) treatment plant since 2001. Due to limitations on the use of fresh Floridan Aquifer water imposed by the State, we expanded the RO plant from 1.5 to 3 million gallons per day of output, maximizing the use of the deep, geothermal and brackish Cretaceous well supply. The current process consists of a plate-and-frame heat exchanger/cooling tower process, followed by RO. The heat exchanger/cooling tower process reduces the Cretaceous water temperature from 122 degrees to around 104.


The RO process operates at a recovery rate of 80 percent.

Tertiary Treatment

This system includes gravity sand filters which filter out any remaining solids left over from the clarifying system.

Quality

Laboratory control tests are performed daily to make sure conditions are suitable for the bacteria that treats the wastewater.