Alachlor in Drinking Water: Health Risks, Sources, and How to Remove It
Alachlor is an organic chemical contaminant that is regulated in US drinking water. The US Environmental Protection Agency (EPA) has set the Maximum Contaminant Level (MCL) for Alachlor at 2 μg/L. Monitoring and limiting this organic contaminant is important for maintaining safe drinking water standards.
Health Effects
Exposure to Alachlor in drinking water above the regulatory limit can lead to several health issues, including problems with the eyes, liver, kidneys, and spleen. Additionally, long-term exposure to this organic chemical is associated with an increased risk of cancer.
How Alachlor Gets Into Tap Water
Alachlor primarily enters drinking water supplies through agricultural herbicide runoff. When applied to crops, rain or irrigation can carry the chemical from agricultural fields into local water sources that feed municipal systems or private wells.
How to Remove Alachlor From Your Water
Water systems and households can utilize treatment methods such as granular activated carbon to reduce Alachlor levels. This type of filtration technology is commonly used and effective at removing organic chemicals from water. Proper maintenance of the carbon treatment system is essential to ensure consistent removal.
Should You Test Your Water?
To verify the levels of Alachlor in your water, you can review your local water utility's annual consumer confidence report or search on WaterQ. Those who rely on private wells near agricultural areas may also consider testing their water for organic herbicides. You can also look up your local water system on WaterQ or check the Alachlor data page for reported levels in your area.
Frequently Asked Questions
Is Alachlor dangerous in drinking water?
Yes, Alachlor can be harmful if consumed in drinking water above the regulatory standard of 2 μg/L. Over time, exposure can cause eye, liver, kidney, and spleen problems, and may also lead to an increased risk of cancer.
How does Alachlor get into tap water?
Alachlor gets into tap water primarily through agricultural herbicide runoff, where the chemical is carried by water from treated crop fields into drinking water sources.
How can I remove Alachlor from my water?
Alachlor can be removed from drinking water using treatment methods like granular activated carbon, which is highly effective at filtering out organic contaminants.
Source: EPA National Primary Drinking Water Regulations and WaterQ National Database. For more contaminants, visit our contaminant library.
What actually removes pesticides and herbicides
These are organic molecules, and granular activated carbon adsorbs them well — it is EPA's designated best available technology for nearly the whole class. An NSF/ANSI 53 filter is sufficient; reverse osmosis is not required. Worth knowing about timing: pesticide levels in surface-water systems spike for a few weeks after spring application, and an annual average in your utility report can hide a much higher seasonal peak.
Works
- Carbon certified for lead (NSF 53)The cheapest thing that genuinely removes lead, cysts and many VOCs.
- Reverse osmosis (NSF 58)The broadest removal available at home: arsenic, nitrate, fluoride, PFAS, TDS.
Will not fix this
- Ion-exchange water softener
- UV disinfection (NSF 55)
- Ion-exchange pitcher
Options that carry the right certification
Ordered cheapest-adequate first. Prices are indicative bands and move often.
| Product | Certification | Upfront | Per year | |
|---|---|---|---|---|
| Aquasana AQ-5200 Under-SinkUnder-sink | NSF/ANSI 42, 53, 401 and P473 certified.Catch:Carbon, not RO — no meaningful fluoride, nitrate or arsenic reduction. | $110–160 | $80–120 | Check price |
| Brita Elite Pitcher FilterPitcher | NSF/ANSI 42 and 53 certified, including a lead reduction claim.Catch:No fluoride, nitrate or arsenic reduction. Not PFAS-rated. | $25–40 | $50–70 | Check price |
| APEC ROES-50 EssenceUnder-sink | Built with WQA-certified components to NSF/ANSI 58.Catch:Needs an under-sink drain connection and a spare hole for the dedicated faucet. Strips minerals — some people dislike the flat taste. | $180–240 | $50–80 | Check price |
Certification listings change. Before buying, confirm the current listing for the exact model in the NSF certified products database — a manufacturer's marketing page is not a certification. WaterQ earns a commission on purchases made through these links at no extra cost to you; see our affiliate disclosure. This is general information, not medical or engineering advice.
For a full breakdown of certifications, running costs and the models worth considering, see our buying guide for pesticides and herbicides.