{"abstract":"The U.S. Environmental Protection Agency (EPA) is publishing a draft list of contaminants that are currently not subject to any proposed or promulgated national primary drinking water regulations for public review and comment. These contaminants are known or anticipated to occur in public water systems and may require regulation under the Safe Drinking Water Act (SDWA) in the future. The draft list provided in this document is the sixth Contaminant Candidate List (CCL) published by the Agency since the SDWA amendments of 1996. The draft Sixth Contaminant Candidate List (CCL 6 or the list) includes 75 chemicals, 4 chemical groups (disinfection byproducts (DBPs), microplastics, per- and polyfluoroalkyl substances (PFAS), and pharmaceuticals) and 9 microbes. The EPA seeks public comment on the draft CCL 6 and the process used to develop the draft CCL 6. The EPA will consider all information and comments received in response to this notice of availability for determining the final CCL 6.","action":"Notice of availability; request for comments.","agencies":[{"raw_name":"ENVIRONMENTAL PROTECTION AGENCY","name":"Environmental Protection Agency","id":145,"url":"https://www.federalregister.gov/agencies/environmental-protection-agency","json_url":"https://www.federalregister.gov/api/v1/agencies/145","parent_id":null,"slug":"environmental-protection-agency"}],"body_html_url":"https://www.federalregister.gov/documents/full_text/html/2026/04/06/2026-06662.html","cfr_references":[{"chapter":null,"citation_url":null,"part":"141","title":40}],"citation":"91 FR 17186","comment_url":"http://www.regulations.gov/commenton/EPA-HQ-OW-2022-0946-0015","comments_close_on":"2026-06-05","correction_of":null,"corrections":[],"dates":"Comments must be received on or before June 5, 2026.","disposition_notes":null,"docket_ids":["EPA-HQ-OW-2022-0946","FRL-10773-01-OW"],"dockets":[{"supporting_documents":[{"title":"Human Health Benchmarks for Pharmaceuticals 2026 Technical Document","document_id":"EPA-HQ-OW-2022-0946-0034"},{"title":"Technical Support Document for the Draft CCL 6 - Contaminant Information Sheets","document_id":"EPA-HQ-OW-2022-0946-0033"},{"title":"Technical Support Document for the Draft CCL 6 - Chemical Contaminants","document_id":"EPA-HQ-OW-2022-0946-0032"},{"title":"Technical Support Document for the Draft CCL 6 - Microbial Contaminants","document_id":"EPA-HQ-OW-2022-0946-0031"},{"title":"40 CFR Part 141 Subpart Z (up to date as of 2-09-2026) Control of Per- and Polyfluoroalkyl Substances (PFAS)","document_id":"EPA-HQ-OW-2022-0946-0030"},{"title":"Announcement of Preliminary Regulatory Determinations for Contaminants on the Fifth Drinking Water Contaminant Candidate List","document_id":"EPA-HQ-OW-2022-0946-0029"},{"title":"A Review of Data for Quantifying Human Exposures to Micro and Nanoplastics and Potential Health Risks. Zarus et al. 2021","document_id":"EPA-HQ-OW-2022-0946-0028"},{"title":"Federal Food, Drug, and Cosmetic Act. 21 U.S.C § 321","document_id":"EPA-HQ-OW-2022-0946-0027"},{"title":"Plasticenta: First evidence of microplastics in human placenta. Ragusa et al. 2021","document_id":"EPA-HQ-OW-2022-0946-0026"},{"title":"Review of the EPA’s Draft Fifth Contaminant Candidate List. EPA Science Advisory Board","document_id":"EPA-HQ-OW-2022-0946-0025"}],"agency_name":"EPA","documents":[{"comment_count":6196,"comment_start_date":"2026-04-06","updated_at":"2026-05-27T01:57:13.961-04:00","comment_url":"https://www.regulations.gov/commenton/EPA-HQ-OW-2022-0946-0015","allow_late_comments":false,"id":"EPA-HQ-OW-2022-0946-0015","comment_end_date":"2026-06-06","regulations_dot_gov_open_for_comment":true}],"supporting_documents_count":19,"id":"EPA-HQ-OW-2022-0946","title":"Drinking Water Contaminant Candidate List 6 (CCL 6)"}],"document_number":"2026-06662","effective_on":null,"end_page":17195,"executive_order_notes":null,"executive_order_number":null,"explanation":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2026/04/06/2026-06662.xml","html_url":"https://www.federalregister.gov/documents/2026/04/06/2026-06662/drinking-water-contaminant-candidate-list-6-draft","images":{"EP06AP26.081":{"large":"https://img.federalregister.gov/EP06AP26.081/EP06AP26.081_large.png","medium":"https://img.federalregister.gov/EP06AP26.081/EP06AP26.081_medium.png","original_size":"https://img.federalregister.gov/EP06AP26.081/EP06AP26.081_original_size.png"},"EP06AP26.080":{"large":"https://img.federalregister.gov/EP06AP26.080/EP06AP26.080_large.png","medium":"https://img.federalregister.gov/EP06AP26.080/EP06AP26.080_medium.png","original_size":"https://img.federalregister.gov/EP06AP26.080/EP06AP26.080_original_size.png"},"EP06AP26.079":{"large":"https://img.federalregister.gov/EP06AP26.079/EP06AP26.079_large.png","medium":"https://img.federalregister.gov/EP06AP26.079/EP06AP26.079_medium.png","original_size":"https://img.federalregister.gov/EP06AP26.079/EP06AP26.079_original_size.png"},"EP06AP26.078":{"large":"https://img.federalregister.gov/EP06AP26.078/EP06AP26.078_large.png","medium":"https://img.federalregister.gov/EP06AP26.078/EP06AP26.078_medium.png","original_size":"https://img.federalregister.gov/EP06AP26.078/EP06AP26.078_original_size.png"},"EP06AP26.077":{"large":"https://img.federalregister.gov/EP06AP26.077/EP06AP26.077_large.png","medium":"https://img.federalregister.gov/EP06AP26.077/EP06AP26.077_medium.png","original_size":"https://img.federalregister.gov/EP06AP26.077/EP06AP26.077_original_size.png"}},"images_metadata":{"EP06AP26.081":{"large":{"identifier":"EP06AP26.081","content_type":"image/png","size":63446,"width":822,"sha":"b1ba4ab25643fa5255c61cf63540643c","url":"https://img.federalregister.gov/EP06AP26.081/EP06AP26.081_large.png","height":543},"medium":{"identifier":"EP06AP26.081","content_type":"image/png","size":19783,"width":497,"sha":"96dafcea0590dc2f5474f169307d9872","url":"https://img.federalregister.gov/EP06AP26.081/EP06AP26.081_medium.png","height":328},"original_size":{"identifier":"EP06AP26.081","content_type":"image/png","size":92313,"width":1875,"sha":"0907685ba26557941c6809510d7587f5","url":"https://img.federalregister.gov/EP06AP26.081/EP06AP26.081_original_size.png","height":1238}},"EP06AP26.080":{"large":{"identifier":"EP06AP26.080","content_type":"image/png","size":36968,"width":823,"sha":"638d2af8fc563770411976065ddf013e","url":"https://img.federalregister.gov/EP06AP26.080/EP06AP26.080_large.png","height":585},"medium":{"identifier":"EP06AP26.080","content_type":"image/png","size":12255,"width":397,"sha":"260ed5aa35148a35dd7a86c011a70e5d","url":"https://img.federalregister.gov/EP06AP26.080/EP06AP26.080_medium.png","height":282},"original_size":{"identifier":"EP06AP26.080","content_type":"image/png","size":17390,"width":1500,"sha":"2e8b4c015ea5142a8d2d86008d5ecb4d","url":"https://img.federalregister.gov/EP06AP26.080/EP06AP26.080_original_size.png","height":1066}},"EP06AP26.079":{"large":{"identifier":"EP06AP26.079","content_type":"image/png","size":51703,"width":822,"sha":"6ab57291d87c0c7ba4fb1d273074a6fc","url":"https://img.federalregister.gov/EP06AP26.079/EP06AP26.079_large.png","height":585},"medium":{"identifier":"EP06AP26.079","content_type":"image/png","size":23211,"width":496,"sha":"9570bb19320b01b5248ed9fb3fb4327f","url":"https://img.federalregister.gov/EP06AP26.079/EP06AP26.079_medium.png","height":353},"original_size":{"identifier":"EP06AP26.079","content_type":"image/png","size":33656,"width":1875,"sha":"3cd2885d9f94df567e07a919332b9232","url":"https://img.federalregister.gov/EP06AP26.079/EP06AP26.079_original_size.png","height":1335}},"EP06AP26.078":{"large":{"identifier":"EP06AP26.078","content_type":"image/png","size":109148,"width":823,"sha":"8d6103655f9ea62399dbe591cb2ac3f3","url":"https://img.federalregister.gov/EP06AP26.078/EP06AP26.078_large.png","height":1337},"medium":{"identifier":"EP06AP26.078","content_type":"image/png","size":44380,"width":435,"sha":"dc33e079122ad209c39b2579b9cea094","url":"https://img.federalregister.gov/EP06AP26.078/EP06AP26.078_medium.png","height":707},"original_size":{"identifier":"EP06AP26.078","content_type":"image/png","size":55738,"width":1642,"sha":"59ae668eda07544e909e83460d9b06ca","url":"https://img.federalregister.gov/EP06AP26.078/EP06AP26.078_original_size.png","height":2667}},"EP06AP26.077":{"large":{"identifier":"EP06AP26.077","content_type":"image/png","size":110601,"width":773,"sha":"5f60773499b4dad97e6156c20f924014","url":"https://img.federalregister.gov/EP06AP26.077/EP06AP26.077_large.png","height":1459},"medium":{"identifier":"EP06AP26.077","content_type":"image/png","size":39884,"width":364,"sha":"11e54619e7152138408ec9d12daf2ac2","url":"https://img.federalregister.gov/EP06AP26.077/EP06AP26.077_medium.png","height":686},"original_size":{"identifier":"EP06AP26.077","content_type":"image/png","size":46626,"width":1374,"sha":"a5e07f77af6b71b10d3999d7ac1137dd","url":"https://img.federalregister.gov/EP06AP26.077/EP06AP26.077_original_size.png","height":2593}}},"json_url":"https://www.federalregister.gov/api/v1/documents/2026-06662?publication_date=2026-04-06","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2026-04-06/2026-06662/mods.xml","not_received_for_publication":null,"page_length":10,"page_views":{"count":6511,"last_updated":"2026-05-28 12:15:07 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2026-04-06/pdf/2026-06662.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":"https://public-inspection.federalregister.gov/2026-06662.pdf?1775220318","publication_date":"2026-04-06","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2026/04/06/2026-06662.txt","regulation_id_number_info":{},"regulation_id_numbers":[],"regulations_dot_gov_info":{"supporting_documents":[{"title":"Human Health Benchmarks for Pharmaceuticals 2026 Technical Document","document_id":"EPA-HQ-OW-2022-0946-0034"},{"title":"Technical Support Document for the Draft CCL 6 - Contaminant Information Sheets","document_id":"EPA-HQ-OW-2022-0946-0033"},{"title":"Technical Support Document for the Draft CCL 6 - Chemical Contaminants","document_id":"EPA-HQ-OW-2022-0946-0032"},{"title":"Technical Support Document for the Draft CCL 6 - Microbial Contaminants","document_id":"EPA-HQ-OW-2022-0946-0031"},{"title":"40 CFR Part 141 Subpart Z (up to date as of 2-09-2026) Control of Per- and Polyfluoroalkyl Substances (PFAS)","document_id":"EPA-HQ-OW-2022-0946-0030"},{"title":"Announcement of Preliminary Regulatory Determinations for Contaminants on the Fifth Drinking Water Contaminant Candidate List","document_id":"EPA-HQ-OW-2022-0946-0029"},{"title":"A Review of Data for Quantifying Human Exposures to Micro and Nanoplastics and Potential Health Risks. Zarus et al. 2021","document_id":"EPA-HQ-OW-2022-0946-0028"},{"title":"Federal Food, Drug, and Cosmetic Act. 21 U.S.C § 321","document_id":"EPA-HQ-OW-2022-0946-0027"},{"title":"Plasticenta: First evidence of microplastics in human placenta. Ragusa et al. 2021","document_id":"EPA-HQ-OW-2022-0946-0026"},{"title":"Review of the EPA’s Draft Fifth Contaminant Candidate List. EPA Science Advisory Board","document_id":"EPA-HQ-OW-2022-0946-0025"}],"comments_count":6196,"agency_id":"EPA","comments_url":"https://www.regulations.gov/docketBrowser?rpp=50&so=DESC&sb=postedDate&po=0&dct=PS&D=EPA-HQ-OW-2022-0946","supporting_documents_count":19,"docket_id":"EPA-HQ-OW-2022-0946","document_id":"EPA-HQ-OW-2022-0946-0015","regulation_id_number":null,"title":"Drinking Water Contaminant Candidate List 6 (CCL 6)","checked_regulationsdotgov_at":"2026-05-27T17:55:04Z"},"regulations_dot_gov_url":"http://www.regulations.gov/commenton/EPA-HQ-OW-2022-0946-0015","significant":null,"signing_date":null,"start_page":17186,"subtype":null,"title":"Drinking Water Contaminant Candidate List 6-Draft","toc_doc":"Drinking Water Contaminant Candidate List 6Draft","toc_subject":null,"topics":[],"type":"Proposed Rule","volume":91}