Radon in Water in Clifton, NJ — Why Passaic County Homeowners Shouldn’t Assume Treatment Covers Everything
Clifton draws from the Passaic Valley Water Commission — a treated municipal supply that undergoes aeration and other processes that significantly reduce radon before water reaches homes. For most Clifton residents, that’s reassuring context. But it’s not the complete picture. Passaic County sits within New Jersey’s elevated-radon geological zone, and for any Clifton-area home on a private well, waterborne radon from local groundwater is a real and testable concern. Even for municipal water customers who’ve found elevated indoor air radon without a clear soil-gas explanation, ruling out water as a contributing factor requires a test — not an assumption. A water assessment that specifically includes radon provides that answer directly.
The Water Pathway for Radon — How It Enters Homes Through the Plumbing
Radon is a naturally occurring radioactive gas formed as uranium decays in bedrock and soil. Airborne radon enters homes through foundation cracks and accumulates in lower living spaces. The water pathway is separate: radon dissolves into groundwater as it moves through uranium-bearing geological formations, and private well water carries it into the home without any treatment to reduce it along the way.
When that water is used in the home — in the shower, the dishwasher, or at a running faucet — radon releases from the water into the indoor air. Research estimates that 10,000 pCi/L of radon in water raises indoor air radon by approximately 1 pCi/L. For a home where both soil-gas and waterborne radon are present, the cumulative contribution to indoor air exposure is higher than either pathway alone would suggest. For municipal water customers, aeration during treatment removes most dissolved radon before it reaches the tap — but “most” is not the same as “all,” and testing gives a definitive answer rather than a probability. Radon in water is invisible, tasteless, and odorless — detection requires a laboratory test specifically ordered for it.
What Passaic County’s Geology Means for Radon in Water
Passaic County occupies a transitional geological zone in New Jersey — the mixed crystalline and sedimentary bedrock of this part of North Jersey is associated with elevated radon in both air and groundwater relative to coastal and southern New Jersey counties. The same geology that drives Passaic County’s above-average airborne radon levels also influences groundwater radon concentrations in private wells throughout the county.
For Clifton’s municipal water customers, the Passaic Valley Water Commission’s treatment processes significantly reduce this risk before distribution. But the geological context remains relevant for any property in the area on a private well — and for municipal customers with unexplained indoor air radon readings who want to rule out the water as a contributing source. Nearby Paterson, Passaic, Nutley, and Bloomfield share the same Passaic County geological profile and the same considerations around waterborne radon.
When Radon in Water Testing Makes Sense for a Clifton Home
- Your property draws from a private well anywhere in Passaic County
- You’ve tested indoor air radon and found elevated levels without a fully identified source
- You’re purchasing a home with a private well and want a complete baseline before closing
- You want to rule out waterborne radon as a contributing factor to indoor air quality concerns
- You’re on municipal water but want certainty rather than relying on treatment assumptions
Radon in Water Risk by Scenario — Clifton Area Homeowners
| Scenario | Risk Level | Recommended Action |
|---|---|---|
| Private well in Passaic County | Higher — direct groundwater exposure in elevated-radon zone | Test immediately; include in any well water panel |
| Clifton municipal water customer | Lower — PVWC treatment reduces radon before distribution | Test if indoor air radon is elevated or if concerned |
| Elevated indoor air radon, source unclear | Water may be contributing — unknown without testing | Test water radon as part of full radon assessment |
| Home purchase, unknown water history | Unknown — baseline needed | Test before or immediately after closing |
What Your Results Mean and What Comes Next
A radon-in-water test returns a specific picocuries-per-liter concentration. Below the EPA’s suggested action level of 4,000 pCi/L, no treatment is required. Above it, aeration systems and granular activated carbon filtration are both established and effective treatment approaches. Our radon in water removal page covers the treatment options in full. For Clifton homeowners also thinking about PFAS, chloramine byproducts, and lead from the Passaic River supply, our water filtration page covers those concerns alongside radon. Our full New Jersey service area covers communities statewide.
Frequently Asked Questions — Radon in Water Testing in Clifton, NJ
Does Passaic County have elevated radon in groundwater?
Yes. Passaic County sits within New Jersey’s elevated-radon geological zone. The mixed crystalline bedrock geology of this part of North Jersey produces naturally occurring radon in groundwater at concentrations that are meaningfully higher than in sedimentary geology areas of South Jersey. Private well owners in Passaic County have clear reason to include radon in any comprehensive well water assessment.
Is radon in Clifton’s municipal water a concern?
For most Clifton municipal customers, the risk is low — the Passaic Valley Water Commission’s treatment processes, including aeration, reduce dissolved radon significantly before distribution. The concern becomes more relevant when indoor air radon is elevated and the source isn’t fully identified, or for any property on a private well regardless of the municipal supply context.
Is radon automatically included in a water quality test?
No. Radon in water requires a specific laboratory analysis ordered separately. A standard panel covering PFAS, lead, bacteria, hardness, and other contaminants does not include radon unless it’s explicitly requested. If radon wasn’t specifically on your water test, you don’t yet have an answer to this question.
What radon level in water requires action?
The EPA’s suggested action level for private well water is 4,000 pCi/L. We walk through your specific results in context — what the number means for your household’s total radon exposure, and what treatment approach makes sense for your specific situation.
How quickly can I get tested?
We’re typically able to schedule within a few days. Sample collection at your home takes under an hour, and laboratory results return within approximately one to two weeks.
Get a Definitive Answer on Radon in Your Clifton Home’s Water
If you’re in Clifton on a private well and haven’t tested for radon in water — or if indoor air radon is a concern you haven’t fully resolved — a radon-in-water test is the most direct way to get a clear answer. We serve Clifton and all of Passaic County. Call us at (732) 357-1988 or reach out online.
