Delhi possesses only one of its 25 public water testing laboratories accredited by the National Accreditation Board for Testing and Calibration Laboratories (NABL), falling short of global standards. This contrasts sharply with states like Tamil Nadu and Tripura, which have 100% NABL accreditation for their public water testing labs. The data highlights a significant gap in Delhi's water quality testing infrastructure, especially following concerns raised by water contamination incidents elsewhere in the country. Other states also show higher accreditation rates.