https://www.epa.gov/national-aquatic-resource-surveys/indicators-phosphorus https://www.epa.gov/national-aquatic-resource-surveys/national-lakes-assessment-2022-results https://www.epa.gov/national-aquatic-resource-surveys/reports-and-data-national-lakes-assessment-2022 https://www.epa.gov/national-aquatic-resource-surveys/national-lakes-assessment-2022-technical-support-document https://www.mdpi.com/2073-4441/12/12/3550
https://www.epa.gov/national-aquatic-resource-surveys/indicators-phosphorus
https://www.epa.gov/national-aquatic-resource-surveys/national-lakes-assessment-2022-results
https://www.epa.gov/national-aquatic-resource-surveys/reports-and-data-national-lakes-assessment-2022
https://www.epa.gov/national-aquatic-resource-surveys/national-lakes-assessment-2022-technical-support-document
https://www.mdpi.com/2073-4441/12/12/3550