According to the Water.org audit of September 30, 2019 (Note 12, Significant Estimates and Concentrations):
"Contributions: Approximately 43% and 55% of all contributions were received from four donors in 2019 and 2018, respectively."
According to the Water.org tax filing for the fiscal year ended September 30, 2019, Water.org reports re: Compensation, Supplemental Information (IRS Form 990, Schedule J, Part III):
Regarding nonfixed payments to officers, directors, trustees, key employees and highest compensated employees (Schedule J, Part I, Line 7):
"Non-fixed payments in the form of a bonus are determined based on personal and organizational performance and the discretion of the Board of Directors."
Water.org reports "Bonus & incentive compensation" payments to eight individuals in calendar year 2018, including $120,711 and $87,874 paid to Jennifer Schorsch, President, and Gary White, CEO & co-founder, respectively. Their reported total compensation in 2018 is $362,910 and $417,575, respectively. The reported "Bonus & incentive compensation" payments to the other six individuals range from $43,078 to $29,354, with associated total compensation ranging from $263,799 to $185,903 in 2018 (IRS Form 990, Schedule J, Part II).