Mount Pleasant Waterworks serves roughly 234,000 people through a mix of deep Charleston Aquifer groundwater and surface water purchased from Charleston Water System. The system uses chloramine as its disinfectant, not chlorine. If you're running a standard Brita pitcher or fridge filter, chloramine passes through most basic carbon media.
In November 2024, Mount Pleasant Waterworks reported PFOS readings of 8.4 parts per trillion and PFOA at 5.5 parts per trillion. The EPA's Maximum Contaminant Level for both PFOS and PFOA is 4 parts per trillion, finalized in April 2024. Both readings exceed the federal MCL.
What this means for Mt Pleasant transplants
If you moved to upper Mt Pleasant (29466) or Daniel Island in the last two years, your utility's readings are above the new federal limit. CWS customers in West Ashley and James Island are on the same wholesale supply chain.
Mount Pleasant's groundwater comes from the Charleston Aquifer, estimated at 50,000 years old. The utility operates four reverse-osmosis treatment plants for this source.
What Pristine can and can't do here
I won't claim any whole-home system addresses specific contaminants at the parts-per-trillion level. That's a point-of-use reverse osmosis conversation, and the right POU model depends on your specific concern. I can test your tap water, show you your numbers, and walk you through what's cert-matched for your situation.
Free water test for Mt Pleasant and Daniel Island residents. Call (843) 302-5720 or text me a time.