Accepting comments from June 9, 2026, through June 30, 2026.
The Idaho Department of Environmental Quality (DEQ) is seeking comment on a draft 401 water quality certification for the Chestnut Heights Subdivision project.
The Chestnut Heights Subdivision project in Caldwell, Idaho, proposes to develop land for single-family building lots. The project includes filling 8 irrigation features and excavating one concrete ditch. The irrigation ditches no longer convey water and are dry. A total of 6,060 linear feet of permanent impacts to the irrigation ditches will occur.
Based upon review of the federal joint permit application, readily available water quality related materials, and certification request in accordance with 40 CFR §§ 121.5 (b) and (c) and 121.7 (c), DEQ, certifies that if the permittee complies with the terms and conditions imposed by the federal permit and the conditions set forth in this water quality certification, then it is reasonable for DEQ to conclude that the activity will comply with water quality requirements, including applicable requirements of the Clean Water Act §§ 301, 302, 303, 306, and 307, Idaho’s “Water Quality Standards” (IDAPA 58.01.02), and other appropriate water quality requirements of state law.
The draft certification is available for public review at DEQ’s State Office (1410 N. Hilton St. Boise, Idaho 83706), at DEQ’s Boise Regional Office (1445 N. Orchard St. Boise, Idaho 83706), and in the related documents linked below. Written comments will be accepted through June 30, 2026, at 5 p.m. Mountain Time. Submit comments electronically using the form below or by mail or email to:
Meghan Cline
1445 N. Orchard St.
Boise, ID 83706
Meghan.Cline@deq.idaho.gov
Related Documents
Draft Certification
Accessibility Services: The Idaho Department of Environmental Quality will provide reasonable language access services and/or disability services for documents at no charge. To request an accommodation under Title VI of the Civil Rights Act of 1964 or Americans with Disabilities Act, contact DEQ’s nondiscrimination coordinator at (208) 373-0271 or accessibility@deq.idaho.gov. Para obtener información en español, visite https://www.deq.idaho.gov/about-us/accessibility/.
Official Government Website
DEQ seeks comment on draft 401 water quality certification for Chestnut Heights Subdivision project
Accepting comments from June 9, 2026, through June 30, 2026.
The Idaho Department of Environmental Quality (DEQ) is seeking comment on a draft 401 water quality certification for the Chestnut Heights Subdivision project.
The Chestnut Heights Subdivision project in Caldwell, Idaho, proposes to develop land for single-family building lots. The project includes filling 8 irrigation features and excavating one concrete ditch. The irrigation ditches no longer convey water and are dry. A total of 6,060 linear feet of permanent impacts to the irrigation ditches will occur.
Based upon review of the federal joint permit application, readily available water quality related materials, and certification request in accordance with 40 CFR §§ 121.5 (b) and (c) and 121.7 (c), DEQ, certifies that if the permittee complies with the terms and conditions imposed by the federal permit and the conditions set forth in this water quality certification, then it is reasonable for DEQ to conclude that the activity will comply with water quality requirements, including applicable requirements of the Clean Water Act §§ 301, 302, 303, 306, and 307, Idaho’s “Water Quality Standards” (IDAPA 58.01.02), and other appropriate water quality requirements of state law.
The draft certification is available for public review at DEQ’s State Office (1410 N. Hilton St. Boise, Idaho 83706), at DEQ’s Boise Regional Office (1445 N. Orchard St. Boise, Idaho 83706), and in the related documents linked below. Written comments will be accepted through June 30, 2026, at 5 p.m. Mountain Time. Submit comments electronically using the form below or by mail or email to:
Meghan Cline
1445 N. Orchard St.
Boise, ID 83706
Meghan.Cline@deq.idaho.gov
Related Documents
Draft Certification
Accessibility Services: The Idaho Department of Environmental Quality will provide reasonable language access services and/or disability services for documents at no charge. To request an accommodation under Title VI of the Civil Rights Act of 1964 or Americans with Disabilities Act, contact DEQ’s nondiscrimination coordinator at (208) 373-0271 or accessibility@deq.idaho.gov. Para obtener información en español, visite https://www.deq.idaho.gov/about-us/accessibility/.
Public Comment Form