KEARNEY STORMWATER MANAGEMENT
MCM #3 Illicit Discharge Detection and Elimination
Blue-green algae can house cyanobacteria that causes illness ranging from mild rash to death in both humans and animals. Blue-green algae forms a scum like pea soup or paint on the surface of the water during the summer and fall. While most blue-algae is harmless, the cyanobacteria is not.
Nebraska monitors 52 public beaches May 1 to September 30 each year, including Lake Minatare, and posts current warnings on the webpage below. Cyanobacteria cannot be seen with the naked eye, so it’s recommended to avoid contact with blue-green algae blooms and to prevent pets from drinking or swimming near them.
For more information on toxic blue-green algae please see:
NDEQ Toxic Algae Factsheet: http://deq.ne.gov/NDEQProg.nsf/OnWeb/ENV042607
“..in the St. Lucie estuary, about half the sea grass, which is a food source for many marine animals, died off during last year’s algae blooms. Among humans who’ve been exposed to the algae, there has been an increase in antibiotic-resistant staph infections. Florida’s governor has declared a state of emergency in four counties,” according to Janice Kaspersen, editor of Stormwater: The Journal for Surface Water Quality Professionals.
Fertilizer in water runoff is boosting the growth of blue-green algae and hurting more than Florida’s $109 billion a year tourist industry. Cyanobacteria flourish with phosphorus and nitrogen, primary ingredients in fertilizers. The fertilizer boosts growth that create large algae blooms during summer and fall that deplete oxygen and diminish sunlight in the water. The bacteria not only affect aquatic life but also cause beach closures for health safety.
Fertilizer is one of the largest pollutants of stormwater runoff in urban areas. Please use fertilizers “sparingly and caringly” – apply according to the directions, when wind is still, and rain is not in the immediate forecast. You’ll be protecting more than just your plants.
Photograph: Toxic blue-green algae bloom in Klamath River in California taken by David McLain for National Geographic.
Amidst the activity, we ask your help in protecting our water quality and MS4 with appropriate fertilizer application. Fertilizer in water causes large algae blooms, hypoxic (dead) zones in water as it decays, and can be toxic to water supply systems. These consequences are easy to prevent with proper application.
1. Apply during calm dry weather to prevent spread into unwanted areas.
2. Apply as directed – excessive lawn feeding contributes to ground water contamination.
3. Sweep fertilizer back on the grass if it falls on the sidewalk or other impervious surface to keep it out of the storm sewer.
4. Consider grass clippings or compost as natural alternatives.
As warmer weather melts the snow piles around town, the runoff makes its way to the city’s outfalls where the contaminants can be seen. The swirled sheen on the water’s surface is oil that was trapped in the snow. Snow traps oils, salts and sediment that are released into the runoff as the snow melts. Snowmelt runoff is one of largest sources of urban water pollution.