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NITROGEN REMOVAL
Meet Alaina Zhang, the 17-year-old Rhode Island student testing whether native seaweed can help clean polluted coastal watersSeaweed is unlikely to provide a complete solution to the many sources of nutrient pollution affecting coastal waters. Reducing the amount ...- In 2006, Hawai‘i listed Waipā Stream, after dense hau bush trapped sediment and blocked fish. Today, restoration cut average turbidity by 62% and restored native fish passageWaipā Stream restoration efforts significantly improved water quality and aquatic habitats. Invasive hau bush removal and feral pig control...
- Iowa conservationists restored more than 200 forgotten river bends. Now this endangered fish is returningIn Iowa, conservationists are bringing back the forgotten oxbow wetlands, shaped like U's, to protect the endangered Topeka shiner fish, wh...
- In 2011, New South Wales sank ex-HMAS Adelaide off the Central Coast; five years of surveys identified 62 fish species from 31 families around the wreck before storm damage led to its closure in July 2024In mid-2024, severe storms wreaked havoc on the ex-HMAS Adelaide artificial reef, leading to significant structural concerns. The superstru...
- At Iowa's Neal Smith Refuge, turning just 10% of cropland into prairie strips cut sediment loss by 95%, phosphorus runoff by 90%, and total nitrogen loss by about 85%Native prairie strips can play a crucial role in reducing agricultural runoff, which has significant environmental implications. By prevent...
- Michigan scientists in 2024 dyed a lake blue and added fertilizer to test if blocking sunlight could prevent algal blooms; rain washed away the dye and the water turned greenScientists dyed Peter Lake blue to test sunlight reduction for algal bloom prevention. Repeated rainfall washed out the dye, allowing algae...
- In 2006, Kentucky identified nutrient problems along 12.8 miles of Fleming Creek. 18 years later, monitoring showed the stream could fully support its aquatic lifeFleming Creek in northeast Kentucky has moved from nutrient-related impairment to full support for its warm water aquatic habitat designate...
- In 2004, Illinois began Cedar Lake restoration with 3 projects to curb erosion. 18 years later, Cedar Creek was delisted for 3 impairments after sediment and TSS improvedCedar Lake erosion restoration Illinois: Extensive erosion restoration efforts at Cedar Lake have significantly improved water quality. Pro...
- In 1994, Idaho listed Rapid Creek for sediment after grazing added excess sediment. 20 years later, 3 reaches were delisted after BMPs improved habitat and water qualityRapid Creek in southeastern Idaho was listed for sediment impairment in 1994 after assessments found that several streams did not support c...
- In 1996, Illinois added Lake Decatur to its pollution list after farm runoff harmed its water. 28 years later, nitrogen levels fell below the 7.8 mg/L limitLake Decatur's water quality improved after implementing agricultural best management practices. Efforts to reduce nutrient and sediment ru...
- In the 1830s, America imported autumn olives from eastern Asia to stop erosion and reclaim mines; now the plant infests much of the United StatesAutumn olive, introduced from Asia, was used for erosion control and land restoration. This shrub's nitrogen-fixing ability and rapid growt...
- In 2012, Jefferson County SWCD teamed up with local groups to restore Indian-Kentuck Creek. 12 years later, conservation work cut nitrogen pollution by 81,259 pounds a yearAgricultural best management practices improved water quality in the Brushy Fork subwatershed. Nutrient and phosphorus inputs were reduced,...
- In 2002, Illinois listed Sugar Creek as polluted by 2 water-quality problems. 20 years later, 1 was cleared after cleanup efforts helped restore healthy oxygen levelsSugar Creek's dissolved oxygen impairment was cleared after twenty years of restoration work. Projects across the watershed focused on redu...
- In 2006, Delaware listed Broadkill River waters as impaired for nutrients. 18 years later, BMPs helped restore 7.6 miles of Ingrams Branch, bringing phosphorus levels below the state thresholdIngrams Branch in Delaware has reached an important water-quality milestone. The 7.6-mile stream segment was once impaired by excess phosph...
- In 2011, Arkansas prioritized Lake Conway-Point Remove to tackle pollution. 13 years later, Conway cut nitrogen 41% and phosphorus 44% with green infrastructure annuallyLake Conway-Point Remove story ultimately shows why the future of water-quality protection may depend on combining engineering with ecology...
- In the late 1990s, Arkansas agencies urged landowners to use BMPs to keep cattle from streams. Today, 2 agencies and local owners protect these sensitive waters togetherFulton County faced water quality issues, prompting conservation efforts in the late 1990s. Landowners embraced livestock exclusion and con...
- In 2006, Arkansas DEQ listed Clear Creek for E. coli. 12 years later, the creek attained the recreation standard in 2018, restoring contact recreation after BMP projectsClear Creek in Arkansas has seen remarkable recovery since battling E. coli contamination back in 2006. Persistent water quality checks and...
- In 2006, Delaware listed the Broadkill watershed for nitrogen and phosphorus impairment. 18 years later, BMPs restored 7.6 miles of Ingrams Branch, ending the phosphorusThe restoration of Ingrams Branch is a powerful example of how best management practices can produce measurable improvements in water quali...
- USDA field pilots replaced most woodchips with corn cobs in nitrate bioreactors; the 75% corn-cob beds removed nitrate up to 10 times fasterField pilots have demonstrated that corn cobs are highly effective in removing nitrates from farm drainage water. These innovative bioreact...
- In 1994, Illinois EPA listed 50.75 miles of Silver Creek as impaired by farm pollution. 28 years later, Illinois removed the creek from its impaired list in 2022Upper Silver Creek in Illinois has been removed from an impaired waters list. Best management practices were installed to reduce pollution ...
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