This document proposes indicators for monitoring the financial sustainability and affordability of WASH (water, sanitation, and hygiene) services post-2015. It outlines two proposed financial sustainability indicators measuring revenue coverage of costs and balance of costs and infrastructure investment. It also proposes a single affordability indicator measuring population spending below 3% of the poverty line on WASH. The document discusses challenges in measuring and interpreting these indicators at a global level and aligning global and national monitoring needs.