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From the Technical Desk

In-depth engineering articles, regulatory matrices, and real-world case studies for plant engineers, OEMs, and municipal operators managing UV disinfection infrastructure across India.

Featured Regulatory Matrix

Water Quality Regulatory Standards Mapping: IS 10500, USP & CPCB

Navigate compliance thresholds for municipal drinking water, industrial pharmaceutical loops, and sewage treatment with our definitive regulatory matrix. Designed to assist engineering teams, project consultants, and procurement officers in precise UV system selection.

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To assist engineering teams, project consultants, and procurement officers in system selection, we have mapped out the precise water quality requirements against global and national regulatory specifications across three core sectors: Municipal Drinking Water, Industrial Process Water, and Sewage & Wastewater Treatment.

The tables below outline the critical biological, physical, and chemical thresholds mandated by regulatory framework norms.

Table 1: Municipal Drinking Water (IS 10500 Standards)

Parameter Type	Key Parameter	Acceptable Limit	Permissible Limit (No alternative source)
Biological	E. coli	Shall not be detectable in any 100 mL sample	No relaxation
Biological	Total Coliform Bacteria	Shall not be detectable in any 100 mL sample	No relaxation
Physical	Turbidity	1 NTU	5 NTU
Physical	pH value	6.5 to 8.5	No relaxation
Physical	Color	5 Hazen units	25 Hazen units
Chemical	Residual Free Chlorine	0.2 mg/L Minimum	Not Applicable
Chemical	Total Dissolved Solids (TDS)	500 mg/L	2000 mg/L
Chemical	Total Hardness (as CaCO3)	200 mg/L	600 mg/L
Chemical	Nitrates (as NO3)	45 mg/L	No relaxation

Table 2: Pharma Process Water (USP / EP / IS Standards)

Parameter	Purified Water (PW) Standard	Water for Injection (WFI) Standard	Role of UV System
Total Aerobic Microbial Count	100 CFU/mL or less	10 CFU/100 mL or less	Disinfects loop to prevent biofilm growth
Total Organic Carbon (TOC)	Less than 500 ppb	Less than 500 ppb	Breaks down trace organic molecules
Water Conductivity (at 25°C)	1.3 uS/cm or less	1.3 uS/cm or less	Monitored to ensure total ionic purity
Bacterial Endotoxins	Not specified	Less than 0.25 EU/mL	Destroys bacteria that shed endotoxins

Table 3: Sewage and Wastewater Treatment (CPCB / NPDES Discharge Norms)

Parameter	CPCB Treated Sewage Standard	NPDES Standard Baseline	Role of UV System
Fecal Coliform	100 MPN/100 mL or less	200 CFU/100 mL or less	Primary Target: Mutates pathogen DNA
Biochemical Oxygen Demand (BOD)	10 mg/L or less	30 mg/L or less	Low BOD allows better UV transmission
Chemical Oxygen Demand (COD)	50 mg/L or less	Varies by industry	High COD can block UV light penetration
Total Suspended Solids (TSS)	10 mg/L or less	30 mg/L or less	Low TSS prevents bacteria from shadowing
pH	6.5 to 8.5	6.0 to 9.0	Ensures discharged effluent is neutral

*Note: Provided for informational purposes only. We assume no responsibility for any errors or omissions in the data presented.

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