Just Moved to Cary, NC — What Should I Know About the Water?

Triangle Waterworks · informational guide

Direct answer: Cary's tap water comes from Jordan Lake, is treated at the Cary/Apex plant Cary operates, and arrives with a chloramine residual and measurable disinfection byproducts. Hardness varies by address — our in-home testing across the area measures 1.6 to 3.7 grains per gallon, soft at the low end and moderately hard at the top. It is fully compliant water, and a free test at your new address tells you what yours actually is.

Where does Cary, NC tap water come from?

From B. Everett Jordan Lake, in the Cape Fear River Basin. The water is treated at the Cary/Apex Water Treatment Facility, a 56 million-gallon-per-day plant co-owned by the Towns of Apex and Cary, with Cary serving as lead agency and operator. The same plant also supplies RDU and RTP South, and — because Cary has run Morrisville's water and sewer utility since 2006 — Morrisville households as well. So if you've moved to Cary from somewhere else in the Triangle, you may or may not be on the same water you had before: Raleigh, Garner, Knightdale, Wake Forest, Rolesville, Wendell and Zebulon are on Raleigh Water's system, which is a different source entirely.

The treatment train at the Cary/Apex plant is more involved than most: powdered activated carbon added to the raw lake water at the pump station, ozonation to oxidize organics and control color, taste and odor, coagulation with alum and polymer, filtration through sand and carbon, fluoride and pH/corrosion-control chemistry, and finally chlorine and ammonia dosed separately into the clearwell to form chloramine — the residual disinfectant that holds through the pipes to your house.

Is Cary, NC water safe to drink?

Yes — it meets EPA standards, and Apex's 2024 report for the shared system recorded no MCL violations. That's the regulatory bar, and Cary's water clears it. There's a second bar worth understanding as a new resident, though: EWG's Tap Water Database applies stricter, non-regulatory health guidelines than the EPA's enforceable limits, and by that measure Cary's system shows 13 contaminants above EWG guidelines, including HAA9 at 27.5 ppb and TTHM at 38.2 ppb, plus PFOA at 2.86 ppt and PFOS at 3.79 ppt.

Both statements are true simultaneously, and it's important not to blur them: the water is legally compliant and safe by federal standards, and there are measurable compounds in it that a homeowner may reasonably want out of their own house. Our full write-up on whether Cary NC water is safe to drink walks through the numbers.

How hard is the water in Cary?

It depends on your address, which is the single most useful thing a new resident can learn. The Town publishes finished water hardness of 25 to 30 ppm (about 1.5–1.75 grains per gallon), and Apex's 2024 report for the shared system gives 33.3 ppm, or 1.9 gpg. Those are averages describing water as it leaves the treatment plant.

What we measure in homes is a wider band: 1.6 to 3.7 grains per gallon depending on the ZIP code. At the bottom that's soft; at the top it's moderately hard, because 3.7 gpg works out to roughly 63 mg/L and the USGS soft/moderately-hard line sits at 60 mg/L.

Neither figure is wrong — they describe different measuring points. A plant-wide average is exactly what a utility should publish; what reaches an individual tap after traveling the distribution system is what a homeowner actually lives with. The only number that settles it for your house is one taken at your address, and that test is free.

Why does my water smell like chlorine some months and not others?

Because the shared Cary/Apex system runs chloramine day to day and switches briefly to free chlorine once a year to flush the distribution system — a step North Carolina encourages for chloramine systems. Chloramine holds a stable residual with very little taste or smell; free chlorine is the one you notice. The dates shift year to year, so watch for the Town's own announcement rather than expecting a fixed window. If you moved in during that period and thought something was wrong with the plumbing, this is usually the explanation.

What should a new Cary homeowner actually do about it?

Test first, then decide. Here's the honest picture of what a whole-home system does and doesn't address:

• Softening resin handles calcium and magnesium — the minerals behind the film on glassware, the crust on faucet aerators, the soap that won't lather, and the scale that accumulates inside a water heater over years. Soft water is not mineral-free water, and deposits are cumulative even at the low end of the range.
• Activated carbon handles what softening can't touch: the chloramine and chlorine taste, and the disinfection byproducts (HAA9, TTHM) documented in the system. PFAS reduction specifically requires carbon certified under NSF/ANSI 53 or P473, or reverse osmosis under NSF/ANSI 58.
• Both together is the all-in-one whole-home system we install — the best of both worlds in one unit, sized from your own test rather than a catalog.

Systems run $3,499 to $9,999 installed after a free water analysis, against $6,000 to $12,000 commonly quoted by national big-brand installers. And there's a genuine local advantage: because Cary's water starts out low in hardness, a softener here regenerates rarely and uses very little salt, so it costs little to run year after year.

Find out what your new Cary address is actually delivering

Take our 60-second water quiz to see which all-in-one system fits your home, or book a free in-home water analysis — the only way to know where in that 1.6–3.7 gpg range your house falls.

Frequently Asked Questions

I just moved to Cary from out of state and my glasses come out of the dishwasher spotty — what's causing that? Spotting and film are mineral-deposit symptoms, and they can show up anywhere in the 1.6–3.7 grain-per-gallon range we measure across Cary. Detergent, rinse aid, and water temperature all play a part too, which is why a hardness reading at your own tap is the fastest way to separate a water issue from a dishwasher setting.

Do I need to buy bottled water in Cary? Cary's water meets EPA standards, so this comes down to taste and what you want filtered at home. A whole-home carbon stage addresses the chlorine and chloramine taste and the disinfection byproducts at every tap, which is generally a better long-term answer than buying and hauling bottles.

My previous city had really different-tasting water — why does Cary's taste the way it does? Source water and disinfectant choice drive most of the difference. Cary treats Jordan Lake water and carries a chloramine residual, and once a year switches to free chlorine, which tastes noticeably stronger. Carbon filtration levels that out year-round.

Is Cary's water the same as Raleigh's? No — different source, different plant, different numbers. Raleigh Water runs about 1.6 grains per gallon with TTHM at 21.7 ppb, while the Cary/Apex system draws from Jordan Lake and shows higher disinfection byproducts, including TTHM of 38.2 ppb in Cary's EWG listing.

How do I find Cary's official water quality report? The Town of Cary publishes an annual report, and Apex publishes its own for the plant the two towns share — both are worth reading. Just remember they describe system-wide averages for finished water, not what comes out of your particular tap.

Related reading: Is Cary NC Water Safe to Drink? | Water Softener in Cary, NC | Whole House Water Filter for Cary | How to Read Your Water Quality Report