The Michigan Department of Environmental Quality's (Inland Lakes) web site listed below is for the current "Requirements and Restrictions on Chemical Treatments for Aquatic Nuisance Control."

http://www.deq.state.mi.us/documents/deq-wd-illm-reqsrestricts.doc

LONG TERM WATER USE RESTRICTIONS

 Renovate (triclopyr): Do not use treated water for irrigation for 120 days following application. As an alternative to waiting 120 days, treated water may be used for irrigation once the triclopyr level in the treatment area is determined to be non-detectable by laboratory analysis. Water samples will be taken approximately 3 weeks after treatment. There is no restriction on use of water from the treatment area to irrigate established grasses.

 Sonar (fluridone): Do not use treated water for irrigation for 30 days. As an alternative to waiting 30 days, treated water may be used for irrigation once the fluridone level in the treatment area is determined to be 5 parts per billion by laboratory analysis. Water samples will be taken approximately 2 weeks after treatment.

 Navigate (2,4-D): Do not use water from treated areas for irrigating plants or mixing sprays for agricultural or ornamental plants, unless and approved assay indicates the 2,4-D concentration is 100 ppb (or less), or only growing crops and non-crops areas labeled for direct treatment with 2,4-D will be affected. Water samples will be taken approximately 3 weeks after treatment. There is no restriction on use of water from the treatment area to irrigate established grasses.

 2,4-D (offshore): Shoreline postings with 2,4-D (offshore) means the treatment area is located more then 250' from shore. Follow the water use restrictions posted if you are irrigating within the 2,4-D treatment area. Follow all other water use restriction times as they are posted.