D.C. Lawn Care Crews Must Stop Fertilizing on Nov. 15, and the City Is Asking Homeowners to Put Their Spreaders Away Too

Lawn care companies working in Washington, D.C., have until Saturday, Nov. 14, to finish the year’s last fertilizer treatments. From Sunday, Nov. 15, until March 1, the District’s fertilizer law bars professionals from spreading it on turf at all.

Homeowners who feed their own grass are not legally bound by the same cutoff. The D.C. Department of Energy and Environment says it strongly encourages them to follow it anyway.

The Nov. 15 to March 1 Window

The rule comes from the Anacostia River Clean Up and Protection Fertilizer Act of 2012, which took effect April 20, 2013. Under the section of the D.C. Code that sets application restrictions, fertilizer may go on turf only “after March 1st and before November 15th” in a calendar year, and only when the ground is not frozen.

DOEE’s lawn care guidance puts it plainly: do not apply fertilizer between Nov. 15 and March 1. The same guidance says to skip it when rain is expected, when the soil is already saturated and when the ground is frozen.

The law covers turf, which DOEE defines as managed, non-farm grass such as home lawns, athletic fields and parks. It applies to professionals who put down fertilizer for pay, and to the stores and distributors that sell it in the District.

What Else the Law Limits

The calendar is only one part of it. According to DOEE’s one-page summary for lawn care professionals, fertilizer cannot be spread within 15 feet of a waterbody or drainage ditch. The code lets that buffer shrink to 10 feet when a drop spreader, a rotary spreader with a deflector or a targeted liquid spray is used.

Phosphorus is the other big limit. Fertilizer containing it may be used only when a soil test from the past three years shows the lawn is short on phosphorus. Otherwise, crews have to use a low-phosphorus mix.

Nitrogen is capped too. At least 20 percent of the nitrogen in a product has to be slow-release, and each application must stay under 0.7 pounds of water-soluble nitrogen and 0.9 pounds of total nitrogen per 1,000 square feet.

Any fertilizer that lands on a sidewalk or driveway has to be swept back onto the grass or into a container right away. Bags have to be stored closed, indoors or off the ground under a waterproof cover, so rain cannot wash the contents into storm drains.

Who Gets Fined, and Who Is Only Asked

Lawn care professionals, distributors and retailers can be inspected, and those that do not follow the law may be fined, DOEE says. The agency’s pages do not list the dollar amounts.

Stores are part of the push. Under D.C. Code 8-104.04, retailers selling lawn fertilizer must prominently display DOEE’s information about the law, including the warning not to fertilize outside the March 1 to Nov. 15 season. DOEE says that signage has been required in stores since June 28, 2016.

For homeowners, the agency relies on persuasion rather than penalties. Its fertilizer law page says property owners are not required to comply but are strongly encouraged to, and to make sure any lawn care professional they hire is aware of it.

Why the District Draws the Line in November

The law is named for the Anacostia River, and its goal is keeping lawn nutrients out of local water. The same code section that covers store signs directs DOEE to teach residents about nutrient pollution, soil testing, reading fertilizer labels and the effects of fertilizer on the Chesapeake Bay.

DOEE’s page on how fertilizer affects the environment says that in two-thirds of the District, runoff from properties carries fertilizer and other pollutants into rivers and streams with little or no treatment. The agency links that runoff to toxic algal blooms, lower oxygen levels in local waterways, foul-smelling water and damaged fish and wildlife habitat, along with harm to pollinating insects.

The same page adds a climate angle. Synthetic lawn fertilizer releases nitrous oxide, and DOEE, citing the U.S. Environmental Protection Agency, says one pound of it warms the climate about 300 times more than a pound of carbon dioxide and can stay in the atmosphere for more than 100 years.

What the Store Sign Tells Homeowners

The sign DOEE prepared for stores is aimed squarely at residents. It says mature lawns seldom need fertilizer at all, and that good lawn care can cut the need or remove it.

For anyone who does feed the grass, the sign lays out the order of steps: test the soil first, read the N-P-K numbers on the bag, and pick a low-phosphorus product with at least 20 percent slow-release nitrogen. It says to fertilize from late spring to early fall, never by hand, and to keep it at least 15 feet from water and off hard surfaces.

The sign also covers mowing. It advises cutting no more than one-third of the grass height at a time, leaving clippings on the lawn, watering early and deeply, and letting grass go dormant during hot, dry summers.

Nearby Deadlines

The District’s cutoff lines up with Maryland’s. Maryland homeowners also cannot fertilize lawns after Nov. 15, and New Jersey’s blackout starts the same day and runs to March 1. Farther north, New York’s winter ban begins Dec. 1.

Questions about the District’s rules go to DOEE at (202) 535-2600, according to the agency’s summary for lawn care professionals.

This article was produced with AI assistance and edited for accuracy against the sources linked above.

Image: UKinUSA – CC BY-SA 2.0/Wikimedia Commons