{"id":44482,"date":"2025-01-12T06:07:23","date_gmt":"2025-01-12T00:37:23","guid":{"rendered":"https:\/\/vajiramandravi.com\/current-affairs\/?p=44482"},"modified":"2025-05-06T11:48:36","modified_gmt":"2025-05-06T06:18:36","slug":"groundwater-contamination-in-india-nitrate-and-chemical-pollutants","status":"publish","type":"post","link":"https:\/\/vajiramandravi.com\/current-affairs\/groundwater-contamination-in-india-nitrate-and-chemical-pollutants\/","title":{"rendered":"Groundwater Contamination in India: Nitrate and Chemical Pollutants"},"content":{"rendered":"<h2><strong>What\u2019s in today\u2019s article?<\/strong><\/h2>\n<ul>\n<li>Why in News?<\/li>\n<li>Central Ground Water Board (CGWB)<\/li>\n<li>Excessive Nitrate in Groundwater: A Growing Concern<\/li>\n<li>Regional Analysis of Nitrate Contamination in Groundwater<\/li>\n<li>Other Major Chemical Contaminants in Groundwater<\/li>\n<li>State of Groundwater in 2024<\/li>\n<\/ul>\n<h2><strong>\u00a0Why in News?<\/strong><\/h2>\n<ul>\n<li>An assessment of India\u2019s groundwater by the Central Ground Water Board (CGWB) found that several States are grappling with a serious problem of nitrate contamination.<\/li>\n<\/ul>\n<h2><strong>Central Ground Water Board (CGWB)<\/strong><\/h2>\n<ul>\n<li><strong>About<\/strong>\n<ul>\n<li>The <strong>Central Groundwater Board (CGWB)<\/strong> is a key organization under India&#8217;s Ministry of Jal Shakti, responsible for monitoring, managing, and regulating groundwater resources.\u00a0<\/li>\n<li>It maintains a vast network of observation wells to assess groundwater quality and availability.\u00a0<\/li>\n<li>It also provides technical guidance, promotes sustainable practices, and formulates policies to address groundwater-related challenges across the country.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Head quarter<\/strong> &#8211; Bhujal Bhawan, Faridabad, Haryana<\/li>\n<li><strong>Organization Setup: <\/strong>The Board is\u00a0<strong>headed by the Chairman<\/strong>\u00a0and\u00a0<strong>has five members<\/strong>.<\/li>\n<li><strong>Measurement of Groundwater Levels: Observation Network<\/strong><\/li>\n<li><strong>Current Network<\/strong>: The Central Ground Water Board (CGWB) uses 26,000 observation wells to manually measure groundwater levels.<\/li>\n<li><strong>Digital Integration:<\/strong> Since 2023, 16,000-17,000 piezometers equipped with digital water level recorders transmit real-time data to a central system.<\/li>\n<\/ul>\n<h2><strong>Excessive Nitrate in Groundwater: A Growing Concern<\/strong><\/h2>\n<ul>\n<li><strong>Increase in Nitrate-Contaminated Districts<\/strong>\n<ul>\n<li>The number of districts with excessive nitrate in groundwater increased from <strong>359 in 2017 to 440 in 2023<\/strong>, impacting nearly <strong>56% of India\u2019s districts<\/strong>.<\/li>\n<li>Excessive nitrate levels are defined as concentrations above <strong>45 mg\/l<\/strong>.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Groundwater Testing and Trends<\/strong>\n<ul>\n<li><strong>2017 Findings<\/strong>: 13,028 samples were analyzed, with <strong>21.6%<\/strong> showing excessive nitrate levels.<\/li>\n<li><strong>2023 Findings<\/strong>: Of 15,239 samples tested, <strong>19.8%<\/strong> had nitrate levels above safe limits.<\/li>\n<li>While the percentage of affected samples has not substantially changed, the number of contaminated districts has risen.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Health Concerns<\/strong>\n<ul>\n<li>Excessive nitrate in groundwater causes <strong>methemoglobinemia<\/strong>, reducing the ability of red blood cells to carry oxygen, particularly affecting infants and vulnerable populations.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Environmental Impact<\/strong>\n<ul>\n<li>Elevated nitrate levels in groundwater can lead to <strong>algal blooms<\/strong> in lakes and ponds, severely degrading aquatic ecosystems by depleting oxygen and harming biodiversity.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Sources of Nitrate Contamination<\/strong>\n<ul>\n<li><strong>Agricultural Practices<\/strong>: Farmers use fertilizers such as <strong>ammonium nitrate, calcium nitrate, urea<\/strong>, and <strong>diammonium hydrogen phosphate<\/strong>, leading to nitrogen leaching into groundwater.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Forms of Dissolved Nitrogen in Groundwater<\/strong>:\n<ul>\n<li>Nitrate (NO3-)<\/li>\n<li>Ammonium (NH4+)<\/li>\n<li>Ammonia (NH3)<\/li>\n<li>Nitrite (NO2-)<\/li>\n<li>Nitrogen gas (N2)<\/li>\n<li>Nitrous oxide (N2O)<\/li>\n<li>Organic nitrogen<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2><strong>Regional Analysis of Nitrate Contamination in Groundwater<\/strong><\/h2>\n<ul>\n<li><strong>States with the Highest Proportion of Contaminated Blocks<\/strong>\n<ul>\n<li><strong>Rajasthan<\/strong>: 49% of tested samples exceeded permissible nitrate levels.<\/li>\n<li><strong>Karnataka<\/strong>: 48% of tested samples were contaminated.<\/li>\n<li><strong>Tamil Nadu<\/strong>: 37% of tested samples showed excessive nitrate levels.<\/li>\n<\/ul>\n<\/li>\n<li><strong>States with Persistent Nitrate Issues<\/strong>\n<ul>\n<li><strong>Rajasthan, Madhya Pradesh, and Gujarat<\/strong>: These states have had a <strong>long-standing nitrate problem<\/strong> with contamination levels remaining relatively constant since 2017.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Emerging Nitrate Concerns in Central and Southern India<\/strong>\n<ul>\n<li>Increasing nitrate contamination has been observed in blocks in <strong>central and southern India<\/strong>, raising alarm.<\/li>\n<li>States with notable levels of contamination:\n<ul>\n<li><strong>Maharashtra<\/strong>: 35.74%<\/li>\n<li><strong>Telangana<\/strong>: 27.48%<\/li>\n<li><strong>Andhra Pradesh<\/strong>: 23.5%<\/li>\n<li><strong>Madhya Pradesh<\/strong>: 22.58%<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2><strong>Other Major Chemical Contaminants in Groundwater<\/strong><\/h2>\n<ul>\n<li><strong>Key Contaminants<\/strong>\n<ul>\n<li><strong>Arsenic, Iron, Fluoride, and Uranium<\/strong>: These chemicals significantly affect groundwater quality alongside nitrate contamination.<\/li>\n<li><strong>Fluoride Contamination: 9.04% of tested groundwater samples had fluoride levels exceeding the permissible limit.<\/strong>\n<ul>\n<li><strong>High-Risk States<\/strong>: Rajasthan, Haryana, Karnataka, Andhra Pradesh, and Telangana reported high fluoride concentrations, making it a \u201cmajor concern.\u201d<\/li>\n<\/ul>\n<\/li>\n<li><strong>Uranium Contamination<\/strong>: Several samples had uranium concentrations exceeding 100 ppb (parts per billion), far above the safe limit of 30 ppb.\n<ul>\n<li>High-Risk States: Rajasthan and Punjab reported the maximum number of contaminated samples. Other affected states include Gujarat, Haryana, Tamil Nadu, Andhra Pradesh, and Karnataka.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li><strong>Cause<\/strong>\n<ul>\n<li>Predominantly observed in regions with over-exploited groundwater (where water withdrawal exceeds replenishment).<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2><strong>State of Groundwater in 2024<\/strong><\/h2>\n<ul>\n<li><strong>Groundwater Extraction<\/strong>: The country\u2019s groundwater extraction rate stands at <strong>60.4%<\/strong>, consistent since 2009.<\/li>\n<li><strong>Safe Zones<\/strong>: Approximately <strong>73% of blocks<\/strong> are classified as \u2018safe,\u2019 indicating sufficient replenishment to balance water withdrawal.<\/li>\n<\/ul>\n<hr \/>\n<h3>\n<strong>Q.1. What are the main contaminants in India\u2019s groundwater?<\/strong><\/h3>\n<p>Nitrate, fluoride, arsenic, iron, and uranium are the primary contaminants affecting groundwater. Excessive nitrate levels, particularly in Rajasthan, Karnataka, and Tamil Nadu, lead to health issues and environmental damage.<\/p>\n<h3><strong>Q.2. How is groundwater quality monitored in India?<\/strong><\/h3>\n<p>The Central Groundwater Board (CGWB) monitors groundwater quality using a network of 26,000 observation wells and digital piezometers, providing real-time data on contamination and availability.<\/p>\n<p><strong>Source: <\/strong><a href=\"https:\/\/www.thehindu.com\/sci-tech\/energy-and-environment\/is-groundwater-contamination-high-in-india-explained\/article69089799.ece#:~:text=The%20most%20concerning%20finding%20was,l%20(milligram%20per%20litre).\" target=\"_blank\" rel=\"nofollow noopener\">TH<\/a> | <a href=\"https:\/\/cgwa.mowr.gov.in\/AboutUs.html\" target=\"_blank\" rel=\"nofollow noopener\">CGWA<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Discover the state of groundwater in India with rising nitrate and chemical contamination. Learn about the health, environmental impacts, and regional challenges associated with groundwater quality in 2024.<\/p>\n","protected":false},"author":5,"featured_media":44483,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[18],"tags":[],"class_list":{"0":"post-44482","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-upsc-mains-current-affairs","8":"no-featured-image-padding"},"acf":[],"_links":{"self":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/posts\/44482","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/comments?post=44482"}],"version-history":[{"count":0,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/posts\/44482\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/media\/44483"}],"wp:attachment":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/media?parent=44482"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/categories?post=44482"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/tags?post=44482"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}