Parameter

Procedure

Permissible limit for drinking water by NABL

TDS

IS 3025 (PART 16) [8] 1984

500 mg/L

Total Hardness

IS 3025 (PART 21) [9] 2009

200 mg/L

Conductivity

IS 3025 (PART 14) [10] 1984

Not specified

E. coli

IS 15185: 2016 [11]

absent

Total coliforms

IS 15185: 2016 [11]

absent

Total organic C

IS 3025 (Part 18) [12] 1984

Test not included in IS 10500