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Emerging Constituents

This document outlines the regulatory initiatives addressing emerging constituents (ECs) in groundwater recharge and reuse, focusing on various stakeholders including the California Department of Public Health (CDPH), State Water Resources Control Board (SWRCB), and Environmental Protection Agency (EPA). It discusses draft regulations, monitoring rules, and the role of water wholesalers, retailers, and treatment operators. The collaborative study by NWRI and other organizations aims to characterize ECs in key water sources, highlighting the presence of pharmaceutical compounds and their toxicological relevance.

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Emerging Constituents

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  1. Emerging Constituents

  2. Regulatory Initiatives • CDPH: Draft Groundwater Recharge/Reuse Regulation (applied in NPDES permits & WDRs) • SWRCB: Blue Ribbon Panel on CECs • EPA: Unregulated Contaminants Monitoring Rule

  3. Emerging Constituents Workgroup • Water Wholesalers • Water Retailers • Wastewater Treatment Operators • Regional Board Staff • CDPH Staff • USGS Staff • Analytical Lab Staff • NWRI Staff • Environmental NGOs

  4. OCWD/MWDSC/NWRI Study to Characterize ECs in the Santa Ana Watershed SACRAMENTO SANFRANCISCO State Project Water (SPW) ColoradoRiver SANBERNARDINO LOSANGELES Santa Ana River (SAR) ColoradoRiverWater (CRW) SANDIEGO

  5. EC Characterization for Municipal Effluents

  6. EC Characterization for Local Surface Waters

  7. EC Characterization for State Project Water

  8. EC Characterization for Colorado River Water

  9. Pharmaceuticals Explanation none detected 1 detected 2 detected 3 detected

  10. EC Characterization in Ground Waters

  11. Toxicological Relevance Pharmaceutical compounds not detected in 91% of wells tested (n = 89). ~0.5 million L >20 million L ~7.5 million L

  12. Public Information Programs Cholecalciferol di-Alpha Tocopheryl Acetate Phytonadione Pyridoxine Hydrochloride Cyanocobalamin

  13. Cholecalciferol Vitamin Ddi-Alpha Tocopheryl Acetate Vitamin EPhytonadione Vitamin KPyridoxine Hydrochloride Vitamin B-6Cyanocobalamin Vitamin B-12

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  15. ECs to be Analyzed

  16. Sampling Locations & Frequency

  17. Emerging Constituents 21

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