Real-time detection of faecally contaminated drinking water with tryptophan-like fl uorescence : de fi ning threshold values

• Urgent need to screen drinking water for faecal contamination rapidly. • Multi-country assessment of TLF as an indicator of faecal contamination. • A 1.3 ppb dissolved tryptophan threshold is effective to infer contamination. • TLF is strongly correlated with thermotolerant coliform concentration. • TLF is a commercially available, easy-touse, reagentless, real-time option. ⁎ Corresponding author. E-mail address: jare1@bgs.ac.uk (J.P.R. Sorensen). https://doi.org/10.1016/j.scitotenv.2017.11.162 0048-9697/© 2017 Published by Elsevier B.V. a b s t r a c t a r t i c l e i n f o