| #Q001 | administrative | operational | mandatory | LCRR Core Compliance Requirements | drinking water | EPA's 2021 LCRR Implementation Fact Sheet describes the 2021 Lead and Copper Rule Revisions (LCRR) requirements that public water systems must comply with starting on October 16, 2024 as outlined in the Lead and Copper Improvement (LCRI) proposal. These requirements include the initial service line inventory, notification to persons served of known or potential lead service line, Tier 1 public notification of a lead action level exceedance, and associated reporting requirements. | Starting on October 16, 2024 | high |
| #Q002 | reporting | reporting | mandatory | Tier 1 Public Notification for Lead Action Level Exceedance | drinking water | The 2021 Lead and Copper Rule Revisions require water systems to issue a Tier 1 Public Notification (PN) when there is an exceedance of the lead action level no later than 24 hours after the systems learns of an exceedance. | When there is an exceedance of the lead action level | high |
| #Q003 | administrative | reporting | mandatory | Preparation and Maintenance of Service Line Inventory | drinking water | The guidance provides essential information to help water systems comply with the 2021 Lead and Copper Rule Revisions requirement to prepare and maintain an inventory of service line materials by October 16, 2024. | By October 16, 2024 | high |
| #Q004 | administrative | unknown | mandatory | Monitoring Waiver Conditions for Small Systems | drinking water | These PWSs must have low lead and/or copper 90th percentile levels and meet plumbing material restrictions. | For public water systems (PWSs) that serve 3,300 or fewer people seeking monitoring waivers under the Lead and Copper Rule Revisions | high |
| #Q005 | operational | operational | mandatory | Simultaneous Compliance with Microbial and Disinfection Byproduct Rules | drinking water | PWSs also have to comply with microbial and disinfection byproduct rules. | | high |
| #Q006 | reporting | reporting | mandatory | Electronic Submission of Water Quality Analyses via CLIP | drinking water | This change to the electronic submission of water quality analyses replaces the WQM (Water Quality Management) portal and ensures that data from laboratories flow to DDW’s database of record, the Safe Drinking Water Information System (SDWIS). | Commencing September 1, 2021 | high |
| #Q007 | administrative | unknown | recommended | Precautionary Interpretation of Water Quality Data | drinking water | Care should be taken in interpreting the data. A single detection of a contaminant may not indicate contamination of a drinking water supply. | | high |
| #Q008 | administrative | operational | recommended | Water Quality File Management and Software Usage | drinking water | For the Water Quality files available below, it is recommended that you copy the files into a folder on your drive and import into most well know database software programs, such as Microsoft Access, FoxPro, or Paradox. | | high |
| #Q009 | reporting | reporting | mandatory | Timely Notification of NL Exceedance | drinking water | State law (Health and Safety §116455) requires timely notification by drinking water systems whenever a notification level is exceeded in drinking water that is provided to consumers. The law's notification requirements apply to: wholesale water systems, who must notify their governing bodies and the water systems that are directly supplied with that drinking water; retail water systems, who must notify their governing bodies and the governing bodies of any local agencies (i.e., city or county, or a city and county) whose jurisdictions include areas supplied with their drinking water; wholesale and retail water systems regulated by the California Public Utilities Commission, who must also notify the commission | whenever a notification level is exceeded in drinking water that is provided to consumers | high |
| #Q010 | corrective_action | health | mandatory | PFAS Response Level Compliance Requirements | drinking water | When a confirmed detection exceeds the response level, a community water system or a nontransient noncommunity public water system is required to: report that detection in the water system's annual consumer confidence report. take a water source where detected levels exceed the response level out of use or provide public notification (as specified in Health and Safety §116378.) within 30 days of the confirmed detection. | When a confirmed detection exceeds the response level | high |
| #Q011 | monitoring | operational | mandatory | Calculation of PFAS Response Level Exceedance | drinking water | To determine whether monitoring shows an exceedance of a response level, the water system must calculate a quarterly running annual average (QRAA). | To determine whether monitoring shows an exceedance of a response level | high |
| #Q012 | reporting | reporting | mandatory | PFAS Detection Reporting in CCR | drinking water | if any monitoring undertaken pursuant to an order issued under section 116378 results in a confirmed detection of PFAS for any analyte tested for per order, the water system shall report the detection in the water system's annual Consumer Confidence Report. | if any monitoring undertaken pursuant to an order issued under section 116378 results in a confirmed detection of PFAS | high |
| #Q013 | reporting | health | recommended | Recommended Consumer Notification for NL Exceedance | drinking water | If a chemical concentration is greater than its notification level in drinking water that is provided to consumers, DDW recommends that the utility inform its customers and consumers about the presence of the chemical, and about health concerns associated with exposure to it. | If a chemical concentration is greater than its notification level | high |
| #Q014 | monitoring | health | recommended | Recommended Actions for Water Served Above Response Level | drinking water | When a drinking water system does not take a source out of service despite the presence of a contaminant in drinking water at a level confirmed to be greater than the response level, DDW recommends the following: Notification of the local governing body (i.e., city council or board of supervisors, or both) that indicates water is being provided that exceeds the chemical's response level, and the reason for the continued use of the source. Notification of the water system's customers and other water consumers that the contaminant is present in their drinking water at a concentration greater than its response level, the level at which source removal is recommended by DDW, and the reason for the continued use of the source. ... Thereafter, DDW recommends the following: (1) Monthly sampling and analysis of the drinking water supply for as long as the contaminant exceeds its response level, and quarterly sampling for 12 months, should the concentration drop below the response level. (2) Quarterly notification of the water system's customers and other water consumers for as long as the contaminant is present at a concentration greater than its response level, using the methods described above. | When a drinking water system does not take a source out of service despite the presence of a contaminant... greater than the response level | high |