Fig. 2
From: Applying a cumulative risk framework to drinking water assessment: a commentary
a: Relative Health Index scores for water quality scenarios for two California water systems serving 70,000 to 90,000 people. cDBPs refer to nine carcinogenic disinfection byproducts listed in Additional file 1: Table S1. b and c: Distribution of cumulative Relative Health Indicator scores for cancer and non-cancer effects in the highest risk tier (b, cumulative scores greater than 1000) and the second highest risk tier (c, cumulative scores of 100–1000). For all data presented in this figure, severity score of 0.041 was used for arsenic as is the most conservative estimate of arsenic’s non-cancer toxicity (Additional file 1: Table S3); and incidence factor of 1% was used for the calculation of all non-cancer scores