Is Roswell Tap Water Safe to Drink? 2026 Guide

Roswell is served by the North Fulton County water system, which is supplied by the Atlanta-Fulton County Water Treatment Plant (AFCWTP) in nearby Johns Creek. AFCWTP draws raw water from the Chattahoochee River and treats it with conventional surface water treatment plus chlorine-based disinfection before distributing it across Roswell, Alpharetta, Milton, Mountain Park, and Johns Creek.

Source water vs treated drinking water

This is worth saying clearly because Roswell residents see local news about recreational Chattahoochee River conditions - bacteria advisories at swim areas, seasonal algae notices, sediment events after heavy rain. None of that describes what comes out of your tap. Recreational river water is what you'd be exposed to if you swam or kayaked. Treated drinking water has been pulled from the river, run through multiple treatment stages, disinfected, and distributed through a closed pipe system. The two are different products with different testing regimes.

That said, what's in the source water still influences what's in the treated water - particularly the disinfection byproducts that form when chlorine reacts with naturally occurring organic matter from the river. For nearby comparisons on the same source and treatment plant, see our guides for Alpharetta, Johns Creek, and Atlanta (also Chattahoochee-sourced, different utility).

EWG's database, drawing on North Fulton County testing data from 2013–2024, identifies multiple contaminants above EWG's stricter health-based guidelines.

Disinfection Byproducts (DBPs)

DBPs form when chlorine reacts with naturally occurring organic matter in Chattahoochee River water. Studies have linked long-term DBP exposure to elevated health risks.

• TTHMs (Total Trihalomethanes): 47.8 ppb - 319x EWG guideline
• HAA5 (Haloacetic acids, 5-compound group): 31.4 ppb - 314x EWG guideline
• Chloroform: 40.3 ppb - 101x EWG guideline
• Bromodichloromethane: 4.43 ppb - 74x EWG guideline
• Dichloroacetic acid: 14.1 ppb - 70x EWG guideline
• Dibromochloromethane: 2.87 ppb - 29x EWG guideline

Heavy Metals & Other Contaminants

Chromium-6: 0.146 ppb - 7.3x EWG guideline. Studies have linked long-term exposure to elevated cancer risk. Reverse osmosis is one of the few point-of-use technologies that effectively reduces it; standard carbon filtration alone does not.

If North Fulton County water is in federal compliance, why do so many contaminants exceed health guidelines?

EWG explains the gap directly: most federal Maximum Contaminant Levels were set in the early 2000s and haven't been updated to reflect more current research on long-term exposure. There is also currently no enforceable federal standard specific to the hexavalent form of chromium.

Two things can be simultaneously true:

• North Fulton water meets all federal Safe Drinking Water Act requirements.
• Independent testing identifies multiple contaminants above current health-based recommendations.

Yes. Roswell water is moderately hard, due to natural calcium and magnesium picked up in the Chattahoochee River watershed. Hardness is consistent across the North Fulton service area.

Most Roswell homeowners notice some or all of these signs:

• White spots and film on dishes and glassware
• "Etched" looking glass after the dishwasher
• Soap that won't lather; "slimy" feel after showering
• Dry skin and dull-feeling hair, especially in winter
• Scale buildup on faucets, showerheads, and toilet bowls
• White crust around water heater fittings
• Reduced water heater efficiency over time

For Roswell's mix of historic homes downtown and newer construction in the surrounding neighborhoods, scale damage looks different - but the underlying hardness is the same. A water softener uses ion exchange to reduce hardness minerals.

Roswell homeowners report a familiar set of taste and smell issues, mostly tied to the chlorinated Chattahoochee source.

Chlorine taste and smell: Most noticeable in summer when AFCWTP uses more disinfectant. Carbon filtration handles it well.

Earthy or musty taste: Naturally occurring MIB and geosmin produced by algae and bacteria in the Chattahoochee can contribute to an earthy or musty taste. Common in surface water systems and not considered harmful at typical levels.

"After a big rain" complaints: Heavy rain in the watershed sometimes increases natural organic matter at the intake, which can briefly affect taste even though the treated water still meets all federal standards. This is one place where in-home filtration smooths out the variability.

Different filtration systems address different problems. For Roswell - and especially given the elevated chromium-6 - here's what tends to help:

Pitcher filters: Reduce chlorine taste. Limited effect on disinfection byproducts. Don't address chromium-6 or hard water.

Refrigerator filters: Only treat water flowing to the fridge dispenser.

Under-sink reverse osmosis (RO): The most important upgrade for Roswell drinking water. Effectively reduces chromium-6, TTHMs, HAA5, chloroform, lead, and PFAS.

Whole-home carbon filtration: Addresses chlorine, taste, smell, and many DBPs at every faucet and shower.

Water softener: Targets hard water symptoms and protects fixtures and appliances.

For a typical Roswell family home - chlorine in summer, DBPs and chromium-6 well above health guidelines, and hard-water scale on fixtures - we generally recommend a whole-home carbon filtration system to handle taste and DBPs at every tap, an under-sink RO for drinking and cooking water, and a water softener to protect plumbing and appliances.

Honest Water Of Georgia is a local family-owned business offering water softener and whole-home filtration installation in Roswell. Our complete whole-home setup is just $3,492 fully installed.