What is 1,3-Dichloropropane and Why Does It Matter?

1,3-Dichloropropane is a synthetic chemical — meaning it doesn't occur naturally in the environment. It belongs to a family of compounds called chlorinated solvents, which are widely used in industrial processes. Common sources include chemical manufacturing, agricultural fumigants, and industrial cleaning operations. When these chemicals are improperly disposed of or spill into the ground, they can seep into groundwater and eventually reach drinking water supplies.

Across the United States, 1,3-dichloropropane has been detected in 17 water systems. The average level found is 0.138 parts per billion (ppb), with the highest recorded measurement reaching 0.5 ppb. While those numbers may sound small, even trace amounts of chlorinated solvents deserve attention — particularly for households with young children, pregnant women, or people with compromised immune systems.

The health picture for 1,3-dichloropropane is still developing. Animal studies have linked exposure to liver and kidney damage, and the compound is considered a possible human carcinogen based on that research. The EPA has not yet set a formal Maximum Contaminant Level (MCL) — the legal limit for this chemical in public drinking water. The good news is that none of the 17 systems where it was detected currently exceed EWG health guidelines. That said, "below the guideline" doesn't always mean "no risk." The EWG cautions that health guidelines for many chlorinated compounds are based on limited data, and long-term, low-level exposure is still an open question among researchers.

Geographically, Alabama accounts for the largest share of detections, with 10 of the 17 affected systems located there. New York follows with 3 systems, and South Carolina, California, and Georgia each report 1 affected system. Alabama's concentration likely reflects its industrial history and the presence of chemical manufacturing facilities in the region. Agricultural fumigant use — historically common across the Southeast — may also contribute to groundwater contamination in those states. New York's detections are less surprising given the density of older industrial sites and the long legacy of chemical use in some upstate communities. California's single detection is notable, since the state has some of the strictest water monitoring requirements in the country — meaning what gets found there is often the result of thorough testing, not necessarily worse contamination.

When it comes to removing 1,3-dichloropropane from drinking water, reverse osmosis (RO) is the most effective method available to homeowners. A properly certified RO system can remove up to 99% of chlorinated organic compounds from tap water. Activated carbon filtration — the kind found in many under-sink and countertop filters — also reduces these compounds significantly, though performance varies by filter quality and flow rate. Look for filters certified by NSF International under Standard 53 or Standard 58, which specifically cover the removal of volatile organic compounds (VOCs) like 1,3-dichloropropane. Echo Water's reverse osmosis systems are built to meet these standards, giving you a reliable layer of protection at the point where your family actually drinks the water.

If you live in Alabama, New York, or any of the other affected states, the most practical first step is requesting your water utility's annual Consumer Confidence Report (CCR). This report lists every contaminant tested in your local supply, along with the levels detected. From there, pairing that information with a home filtration system designed for VOC removal puts you in control — without having to rely solely on what comes out of the tap.

Regulatory Standards for 1,3-Dichloropropane

Cities With the Highest 1,3-Dichloropropane Levels

States Most Affected by 1,3-Dichloropropane

Frequently Asked Questions

Related Contaminant Guides