Examine the environmental impact of religious idol immersion in urban water bodies and evaluate the effectiveness of CPCB guidelines in mitigating it.

Idol immersion has turned a mass religious practice into a seasonal pollution event, with roughly 1,00,000 idols entering India's water bodies each year [3]. The CPCB's Revised Guidelines on Idol Immersion, in force since 1 January 2021 [2], are sound in design but weak in delivery.

Environmental impact on urban water bodies

• Heavy metals: synthetic paints and dyes release lead, mercury, chromium and cadmium; a CPCB study of the Hooghly (1993–95) recorded about 32 tonnes of colours and 16.8 tonnes of varnish and garjan oil entering the river annually [3].
• Bioaccumulation: these metals move up the aquatic food chain, affecting fish and consumers.
• Plaster of Paris (PoP) dissolves slowly, raising siltation and shrinking the depth of urban lakes, as complaints from Bengaluru's lakes show.
• Oxygen depletion: oil, grease and floral waste raise BOD; thermocol and single-use plastic accessories persist as litter, adding debris-removal costs for municipal bodies [3].

Strengths of the CPCB framework

• Source control: ban on PoP idols, promotion of natural clay, prohibition of toxic dyes, thermocol and single-use plastic [1].
• Diversion, not denial: civic bodies to provide artificial immersion tanks, shifting immersion out of natural water bodies without banning the ritual [1].
• Monitoring: SPCBs to test water quality pre-, during and post-immersion in tier-1 cities; artisans and large manufacturers to register with urban local bodies [1].
• Judicial backing: the Bombay High Court (2009) prompted the guidelines; the Calcutta High Court (2010) ordered debris removal within 24 hours [3].

Limits in practice

• They remain advisory, not penal — CPCB itself told the Bombay High Court in 2025 that they are advisory, and was pulled up for shifting stance [4].
• Enforcement reaches large organised pujas, while thousands of smaller immersions go unchecked; outside Gujarat, Karnataka and Maharashtra the norms went "largely unheeded" [3].

Thus, the guidelines correctly target materials, sites and monitoring, but lack statutory teeth and SPCB capacity. Making them enforceable rules under the Water Act framework, publishing the three-stage test data, subsidising clay idols for artisans, and building artificial tanks in every ward can align faith with ecological duty under Article 51A(g) and SDG 6.