1080 and water safety — what you need to know

Concern about 1080 and water contamination is common, particularly among people who live near operational areas or source drinking water from streams and rivers. The evidence on this is fairly clear, but understanding both what the science says and what the practical limits are is useful.

Does 1080 contaminate waterways?

DOC and regional councils are required to maintain buffer zones around waterways during aerial operations — typically no bait is dropped within 100 metres of a stream or river. In practice, bait does occasionally land closer to water due to wind drift, and carcasses from poisoned animals can enter waterways.

Studies in New Zealand have detected 1080 in waterways following operations, but typically at very low concentrations that fall below drinking water guidelines. The compound breaks down relatively quickly in water — degradation is faster in warmer conditions and slower in cold, acidic environments like mountain streams.

What are the official guidelines?

The NZ drinking water standard for 1080 is 0.002 mg/L. Monitoring conducted by regional councils following operations has generally found concentrations well below this threshold, and detections typically clear within days to weeks.

Should I be concerned about my water supply?

If you are on a town supply, your water is tested and treated — 1080 contamination from an operation is extremely unlikely to reach you at harmful concentrations.

If you are on a private rural supply sourced from a stream or spring near an operational area, some precautions are reasonable:

• Check 1080Alert for operations near your catchment
• Contact your regional council before and after a planned operation — they can advise on monitoring and any precautionary measures
• Consider using stored or bottled water for the first week following a nearby drop if your intake is close to the operational area

What about trampers drinking from streams?

The risk to trampers drinking untreated stream water near operational areas is low but not zero, particularly in the first few days after a drop. If you are tramping through an active or recently completed operational area, it is prudent to treat or filter water as you would for any backcountry source, and to check signage at entry points.