Turfgrass Nutrient Management

Maryland's​ lawn fertilizer law​

​Maryland's lawn fertilizer law helps protect the Chesapeake Bay from excess nutrients entering its waters from urban sources, including golf courses, parks, recreation areas, businesses and thousands of lawns. Nutrients, primarily nitrogen and phosphorus, are key ingredients in lawn fertilizer. When it rains, unused nutrients can wash into nearby storm drains and streams that empty into the Chesapeake Bay.

Once in our waterways, these nutrients contribute to the growth of algae blooms that block sunlight from reaching Bay grasses, rob the water of oxygen and threaten underwater life. While certain restrictions on fertilizer use have been in place for farmers since 2001, everyone needs to do their part to protect and restore the Bay. Maryland’s lawn fertilizer law took effect October 1, 201​3. 

For lawn care professionals

​Lawn care professionals hired to apply fertilizer to lawns must be certified by the department or work under the direct supervision of an individual who is certified. This includes professionals for hire as well as individuals responsible for turf management at golf courses, public parks, airports, athletic fields, businesses, cemeteries and other non-agricultural properties.

• Get certified: The department offers fertilizer applicator training and certification exams throughout the year. 
  • See upcoming exam dates and training opportunities
  • Review fertilizer applicator exam topics
• Renew certificates annually by December 31: Professional Fertilizer Applicator Certificates are valid through December 31 of each year. Certificates may be renewed yearly for a $100 fee and verification of recertification training.
• Apply for a business license: Licenses are required for individuals and businesses that fertilize turf. Licenses are valid for up to one year and expire on December 31 of each year.  Download​ a business license application. - PDF - 249.2 KB  
• File Annual Fertilizer Application Reports by March 1 of each year. Save time by filing electronically at Maryland ​OneStop.
• Avoid penalties​: Violators are subject to civil penalties of up to $1,000 for the first violation and $2,000 for each subsequent violation.
• View our quick reference guide for lawn care pros