OAR 340-041-0021
pH

(1)

Unless otherwise specified in OAR 340-041-0101 (Basin-Specific Criteria (Main Stem Columbia River): Beneficial Uses to Be Protected in the Main Stem Columbia River) through 340-041-0350 (The Three Basin Rule: Clackamas, McKenzie (above RM 15) & the North Santiam), pH values (Hydrogen ion concentrations) may not fall outside the following ranges:

(a)

Marine waters: 7.0-8.5;

(b)

Estuarine and fresh waters: See basin specific criteria (OAR 340-041-0101 (Basin-Specific Criteria (Main Stem Columbia River): Beneficial Uses to Be Protected in the Main Stem Columbia River) through 340-041-0350 (The Three Basin Rule: Clackamas, McKenzie (above RM 15) & the North Santiam)).

(2)

Waters impounded by dams existing on January 1, 1996, which have pHs that exceed the criteria are not in violation of the standard, if the Department determines that the exceedance would not occur without the impoundment and that all practicable measures have been taken to bring the pH in the impounded waters into compliance with the criteria.

Source: Rule 340-041-0021 — pH, https://secure.­sos.­state.­or.­us/oard/view.­action?ruleNumber=340-041-0021.

340‑041‑0001
Preface 340‑041‑0002
Definitions 340‑041‑0004
Antidegradation 340‑041‑0007
Statewide Narrative Criteria 340‑041‑0009
Bacteria 340‑041‑0011
Biocriteria 340‑041‑0016
Dissolved Oxygen 340‑041‑0019
Nuisance Phytoplankton Growth 340‑041‑0021
pH 340‑041‑0028
Temperature 340‑041‑0031
Total Dissolved Gas 340‑041‑0032
Total Dissolved Solids (TDS) 340‑041‑0033
Toxic Substances 340‑041‑0036
Turbidity 340‑041‑0046
Water Quality Limited Waters 340‑041‑0053
Mixing Zones 340‑041‑0057
Implementation at Domestic Wastewater Treatment Works 340‑041‑0059
Variances 340‑041‑0061
Other Implementation of Water Quality Criteria 340‑041‑0101
Basin-Specific Criteria (Main Stem Columbia River): Beneficial Uses to Be Protected in the Main Stem Columbia River 340‑041‑0103
Basin-Specific Criteria (Main Stem Columbia River): Approved TMDLs in the Basin 340‑041‑0104
Basin-Specific Criteria (Main Stem Columbia River): Water Quality Standards and Policies Specific to the Main Stem Columbia River 340‑041‑0121
Basin-Specific Criteria (Main Stem Snake River): Beneficial Uses to Be Protected in the Main Stem Snake River 340‑041‑0122
Basin-Specific Criteria (Main Stem Snake River): Approved TMDLs in the Basin 340‑041‑0124
Basin-Specific Criteria (Main Stem Snake River): Water Quality Standards and Policies Specific to the Main Stem Snake River 340‑041‑0130
Basin-Specific Criteria (Deschutes): Beneficial Uses to Be Protected in the Deschutes Basin 340‑041‑0133
Basin-Specific Criteria (Deschutes): Approved TMDLs in the Basin: 340‑041‑0135
Basin-Specific Criteria (Deschutes): Water Quality Standards and Policies for this Basin 340‑041‑0140
Basin-Specific Criteria (Goose and Summer Lakes): Beneficial Uses to be Protected in Goose and Summer Lake Basins 340‑041‑0143
Basin-Specific Criteria (Goose and Summer Lakes): Approved TMDLs in the Basin: 340‑041‑0145
Basin-Specific Criteria (Goose and Summer Lakes): Water Quality Standards and Policies for this Basin 340‑041‑0151
Basin-Specific Criteria (Grande Ronde): Beneficial Uses to Be Protected in the Grande Ronde Basin 340‑041‑0154
Basin-Specific Criteria (Grande Ronde): Approved TMDLs in the Basin: 340‑041‑0156
Basin-Specific Criteria (Grande Ronde): Water Quality Standards and Policies for this Basin 340‑041‑0160
Basin-Specific Criteria (Hood): Beneficial Uses to Be Protected in the Hood Basin 340‑041‑0164
Basin-Specific Criteria (Hood): Approved TMDLs in the Basin: 340‑041‑0165
Basin-Specific Criteria (Hood): Water Quality Standards and Policies for this Basin 340‑041‑0170
Basin-Specific Criteria (John Day): Beneficial Uses to Be Protected in the John Day Basin 340‑041‑0174
Basin-Specific Criteria (John Day): Approved TMDLs in the Basin: 340‑041‑0175
Basin-Specific Criteria (John Day): Water Quality Standards and Policies for this Basin 340‑041‑0180
Basin-Specific Criteria (Klamath): Beneficial Uses to Be Protected in the Klamath Basin 340‑041‑0184
Basin-Specific Criteria (Klamath): Approved TMDLs in the Basin: 340‑041‑0185
Basin-Specific Criteria (Klamath): Water Quality Standards and Policies for this Basin 340‑041‑0190
Basin-Specific Criteria (Malheur Lake): Beneficial Uses to Be Protected in the Malheur Lake Basin 340‑041‑0194
Basin-Specific Criteria (Malheur Lake): Approved TMDLs in the Basin: 340‑041‑0195
Basin-Specific Criteria (Malheur Lake): Water Quality Standards and Policies for this Basin 340‑041‑0201
Basin-Specific Criteria (Malheur River):Beneficial Uses to Be Protected in the Malheur River Basin 340‑041‑0204
Basin-Specific Criteria (Malheur River): Approved TMDLs in the Basin: 340‑041‑0207
Basin-Specific Criteria (Malheur River): Water Quality Standards and Policies for this Basin 340‑041‑0220
Basin-Specific Criteria (Mid Coast Basin): Beneficial Uses to Be Protected in the Mid Coast Basin 340‑041‑0224
Basin-Specific Criteria (Mid Coast Basin): Approved TMDLs in the Basin: 340‑041‑0225
Basin-Specific Criteria (Mid Coast Basin): Water Quality Standards and Policies for this Basin 340‑041‑0230
Basin-Specific Criteria (North Coast): Beneficial Uses to Be Protected in the North Coast Basin 340‑041‑0234
Basin-Specific Criteria (North Coast): Approved TMDLs in the Basin: 340‑041‑0235
Basin-Specific Criteria (North Coast): Water Quality Standards and Policies for this Basin 340‑041‑0250
Basin-Specific Criteria (Owyhee): Beneficial Uses to Be Protected in the Owyhee Basin 340‑041‑0254
Basin-Specific Criteria (Owyhee): Approved TMDLs in the Basin: 340‑041‑0256
Basin-Specific Criteria (Owyhee): Water Quality Standards and Policies for this Basin 340‑041‑0260
Basin-Specific Criteria (Powder/Burnt): Beneficial Uses to Be Protected in the Powder/Burnt Basins 340‑041‑0264
Basin-Specific Criteria (Powder/Burnt): Approved TMDLs in the Basin: 340‑041‑0265
Basin-Specific Criteria (Powder/Burnt): Water Quality Standards and Policies for this Basin 340‑041‑0271
Basin-Specific Criteria (Rogue): Beneficial Uses to Be Protected in the Rogue Basin 340‑041‑0274
Basin-Specific Criteria (Rogue): Approved TMDLs in the Basin: 340‑041‑0275
Basin-Specific Criteria (Rogue): Water Quality Standards and Policies for this Basin 340‑041‑0286
Basin-Specific Criteria (Sandy Basin): Beneficial Uses to Be Protected in the Sandy Basin 340‑041‑0289
Basin-Specific Criteria (Sandy Basin): Approved TMDLs in the Basin: 340‑041‑0290
Basin-Specific Criteria (Sandy Basin): Water Quality Standards and Policies for this Basin 340‑041‑0300
Basin-Specific Criteria (South Coast): Beneficial Uses to Be Protected in the South Coast Basin 340‑041‑0304
Basin-Specific Criteria (South Coast): Approved TMDLs in the Basin 340‑041‑0305
Water Quality Standards and Policies for South Coast Basin 340‑041‑0310
Basin-Specific Criteria (Umatilla): Beneficial Uses to Be Protected in the Umatilla Basin 340‑041‑0314
Basin-Specific Criteria (Umatilla): Approved TMDLs in the Basin: 340‑041‑0315
Basin-Specific Criteria (Umatilla): Water Quality Standards and Policies for this Basin 340‑041‑0320
Basin-Specific Criteria (Umpqua Basin): Beneficial Uses to Be Protected in the Umpqua Basin 340‑041‑0324
Basin-Specific Criteria (Umpqua Basin): Approved TMDLs in the Basin: 340‑041‑0326
Basin-Specific Criteria (Umpqua Basin): Water Quality Standards and Policies for this Basin 340‑041‑0330
Basin-Specific Criteria (Walla Walla): Beneficial Uses to Be Protected in the Walla Walla Basin 340‑041‑0334
Basin-Specific Criteria (Walla Walla): Approved TMDLs in the Basin: 340‑041‑0336
Basin-Specific Criteria (Walla Walla): Water Quality Standards and Policies for this Basin 340‑041‑0340
Basin-Specific Criteria (Willamette): Beneficial Uses to Be Protected in the Willamette Basin 340‑041‑0344
Basin-Specific Criteria (Willamette): Approved TMDLs in the Basin: 340‑041‑0345
Basin-Specific Criteria (Willamette): Water Quality Standards and Policies for this Basin 340‑041‑0350
The Three Basin Rule: Clackamas, McKenzie (above RM 15) & the North Santiam 340‑041‑8033
Division 41 Tables and Figures
Last Updated

Jun. 8, 2021

Rule 340-041-0021’s source at or​.us