1. American Water Works Association. (2021).Improving the evaluation of household‐level affordability in SDWA rulemaking: New approaches.https://www.awwa.org/Portals/0/AWWA/Government/ImprovingtheEvaluationofHouseholdLevelAffordabilityinSDWARulemakingNewApproaches.pdf.
2. Black & Veatch. (2021).2021 50 largest cities water and wastewater report.https://www.bv.com/resources/2021-50-largest-cities-water-and-wastewater-report
3. California Low Income Water Rate Assistance Act. (2015).Assembly Bill No 401 CHAPTER 662 Statutes of 2015.