OHA Drinking Water Services
OR41
PWS ID: 00657 ---- PORTLAND WATER BUREAU
Maximum Residual Disinfection Level (MRDL) Samples
MRDL Monitoring Requirements :: Excel Spreadsheet

Monitoring
Period		 Entry
Point		 Samples
Required		 Samples
Collected		 Period
Avg		 Annual
Avg		 Level
Compliance
Jun 01, 2025 DIST-A 240 0 2.0Y
May 01, 2025 DIST-A 240 259 1.9 2.0Y
Apr 01, 2025 DIST-A 240 254 1.9 2.0Y
Mar 01, 2025 DIST-A 240 251 2 2.0Y
Feb 01, 2025 DIST-A 240 259 2.0 2.0Y
Jan 01, 2025 DIST-A 240 253 2 2.0Y
Dec 01, 2024 DIST-A 240 254 2 2.0Y
Nov 01, 2024 DIST-A 240 260 2 2.0Y
Oct 01, 2024 DIST-A 240 252 1.9 2.0Y
Sep 01, 2024 DIST-A 243 263 1.9 2.0Y
Aug 01, 2024 DIST-A 240 262 2 2.0Y
Jul 01, 2024 DIST-A 240 253 2.1 2.0Y
Jun 01, 2024 DIST-A 243 259 2 2.0Y
May 01, 2024 DIST-A 243 261 1.8 2.0Y
Apr 01, 2024 DIST-A 240 253 1.9 2.0Y
Mar 01, 2024 DIST-A 240 256 2 2.0Y
Feb 01, 2024 DIST-A 240 251 1.9 1.9Y
Jan 01, 2024 DIST-A 240 252 2.01 1.9Y
Dec 01, 2023 DIST-A 240 265 2 1.9Y
Nov 01, 2023 DIST-A 240 257 2.0 2.0Y
Oct 01, 2023 DIST-A 240 253 1.8 2.0Y
Sep 01, 2023 DIST-A 249 270 1.9 2.0Y
Aug 01, 2023 DIST-A 240 254 2 2.0Y
Jul 01, 2023 DIST-A 243 260 2.1 2.0Y
Jun 01, 2023 DIST-A 243 259 2.0 2.0Y
May 01, 2023 DIST-A 240 253 1.8 2.0Y
Apr 01, 2023 DIST-A 240 259 1.9 2.0Y
Mar 01, 2023 DIST-A 240 253 1.9 2.0Y
Feb 01, 2023 DIST-A 240 242 1.9 2.0Y
Jan 01, 2023 DIST-A 240 257 2.0 2.0Y
Dec 01, 2022 DIST-A 240 271 2.2 2.0Y
Nov 01, 2022 DIST-A 240 270 2.1 2.0Y
Oct 01, 2022 DIST-A 243 264 2.1 2.0Y
Sep 01, 2022 DIST-A 243 263 2 1.9Y
Aug 01, 2022 DIST-A 240 253 2 1.9Y
Jul 01, 2022 DIST-A 243 241 2 1.9Y
Jun 01, 2022 DIST-A 240 252 1.85 1.9Y
May 01, 2022 DIST-A 240 252 1.9 1.9Y
Apr 01, 2022 DIST-A 240 257 1.9 1.9Y
Mar 01, 2022 DIST-A 240 251 2 1.9Y
Feb 01, 2022 DIST-A 240 252 2 1.9Y
Jan 01, 2022 DIST-A 240 253 2.0 1.9Y
Dec 01, 2021 DIST-A 240 259 2 1.9Y
Nov 01, 2021 DIST-A 240 253 1.8 1.9Y
Oct 01, 2021 DIST-A 240 259 1.7 1.9Y
Sep 01, 2021 DIST-A 243 252 2 1.9Y
Aug 01, 2021 DIST-A 240 256 2 1.9Y
Jul 01, 2021 DIST-A 240 258 1.9 1.9Y
Jun 01, 2021 DIST-A 240 258 1.7 1.9Y
May 01, 2021 DIST-A 240 253 1.9 1.9Y
Apr 01, 2021 DIST-A 240 257 2 1.9Y
Mar 01, 2021 DIST-A 240 249 2 1.9Y
Feb 01, 2021 DIST-A 240 253 2 1.9Y
Jan 01, 2021 DIST-A 240 268 1.9 1.9Y
Dec 01, 2020 DIST-A 240 265 2.00 1.9Y
Nov 01, 2020 DIST-A 243 260 2 1.9Y
Oct 01, 2020 DIST-A 240 255 1.75 1.9Y
Sep 01, 2020 DIST-A 240 256 2 1.9Y
Aug 01, 2020 DIST-A 243 257 1.90 1.9Y
Jul 01, 2020 DIST-A 240 251 2 1.8Y
Jun 01, 2020 DIST-A 243 245 1.8 1.8Y
May 01, 2020 DIST-A 240 258 1.78 1.8Y
Apr 01, 2020 DIST-A 240 256 1.9 1.8Y
Mar 01, 2020 DIST-A 240 250 2 1.8Y
Feb 01, 2020 DIST-A 240 260 1.9 1.8Y
Jan 01, 2020 DIST-A 240 259 2 1.8Y
Dec 01, 2019 DIST-A 240 259 2 1.8Y
Nov 01, 2019 DIST-A 240 260 1.7 1.8Y
Oct 01, 2019 DIST-A 240 256 1.7 1.8Y
Sep 01, 2019 DIST-A 240 259 1.6 1.8Y
Aug 01, 2019 DIST-A 243 262 1.79 1.8Y
Jul 01, 2019 DIST-A 243 270 1.8 1.8Y
Jun 01, 2019 DIST-A 240 261 1.7 1.8Y
May 01, 2019 DIST-A 240 259 1.7 1.8Y
Apr 01, 2019 DIST-A 240 274 1.8 1.8Y
Mar 01, 2019 DIST-A 240 258 1.9 1.8Y
Feb 01, 2019 DIST-A 240 268 1.90 1.8Y
Jan 01, 2019 DIST-A 240 257 1.97 1.8Y
Dec 01, 2018 DIST-A 240 258 1.8 1.7Y
Nov 01, 2018 DIST-A 246 272 1.7 1.7Y
Oct 01, 2018 DIST-A 240 287 1.73 1.7Y
Sep 01, 2018 DIST-A 240 255 1.8 1.7Y
Aug 01, 2018 DIST-A 243 273 1.8 1.7Y
Jul 01, 2018 DIST-A 243 262 1.7 1.7Y
Jun 01, 2018 DIST-A 243 262 1.7 1.7Y
May 01, 2018 DIST-A 240 277 1.8 1.7Y
Apr 01, 2018 DIST-A 240 259 1.7 1.7Y
Mar 01, 2018 DIST-A 240 260 1.7 1.7Y
Feb 01, 2018 DIST-A 210 258 1.6 1.7Y
Jan 01, 2018 DIST-A 210 260 1.7 1.7Y
Dec 01, 2017 DIST-A 210 258 1.8 1.8Y
Nov 01, 2017 DIST-A 210 262 1.7 1.7Y
Oct 01, 2017 DIST-A 210 283 1.7 1.7Y
Sep 01, 2017 DIST-A 210 256 1.7 1.7Y
Aug 01, 2017 DIST-A 210 282 1.8 1.7Y
Jul 01, 2017 DIST-A 216 263 1.7 1.7Y
Jun 01, 2017 DIST-A 210 256 1.7 1.7Y
May 01, 2017 DIST-A 210 266 1.7 1.7Y
Apr 01, 2017 DIST-A 210 255 1.7 1.7Y
Mar 01, 2017 DIST-A 210 263 1.8 1.7Y
Feb 01, 2017 DIST-A 210 258 1.8 1.8Y
Jan 01, 2017 DIST-A 210 258 1.9 1.8Y
Dec 01, 2016 DIST-A 210 257 1.76 1.8Y
Nov 01, 2016 DIST-A 210 257 1.64 1.8Y
Oct 01, 2016 DIST-A 216 257 1.6 1.8Y
Sep 01, 2016 DIST-A 210 253 1.5 1.8Y
Aug 01, 2016 DIST-A 210 280 1.8 1.8Y
Jul 01, 2016 DIST-A 210 258 1.70 1.8Y
Jun 01, 2016 DIST-A 210 254 1.8 1.8Y
May 01, 2016 DIST-A 210 236 1.8 1.8Y
Apr 01, 2016 DIST-A 210 223 1.8 1.8Y
Mar 01, 2016 DIST-A 210 258 2 1.9Y
Feb 01, 2016 DIST-A 210 225 1.9 1.8Y
Jan 01, 2016 DIST-A 210 231 1.8 1.9Y
Dec 01, 2015 DIST-A 210 255 2 1.9Y
Nov 01, 2015 DIST-A 210 230 1.7 1.9Y
Oct 01, 2015 DIST-A 210 228 1.7 1.9Y
Sep 01, 2015 DIST-A 210 238 1.7 1.9Y
Aug 01, 2015 DIST-A 213 241 1.8 1.9Y
Jul 01, 2015 DIST-A 210 236 1.9 2.0Y
Jun 01, 2015 DIST-A 210 281 2.0 2.0Y
May 01, 2015 DIST-A 213 226 1.84 2.0Y
Apr 01, 2015 DIST-A 210 280 1.88 2.0Y
Mar 01, 2015 DIST-A 210 286 1.9 1.9Y
Feb 01, 2015 DIST-A 210 246 2 2.0Y
Jan 01, 2015 DIST-A 213 269 2.0 2.0Y
Dec 01, 2014 DIST-A 210 285 2.0 2.0Y
Nov 01, 2014 DIST-A 210 243 2.0 2.0Y
Oct 01, 2014 DIST-A 213 336 1.9 2.0Y
Sep 01, 2014 DIST-A 219 319 2.0 2.0Y
Aug 01, 2014 DIST-A 213 290 2 1.9Y
Jul 01, 2014 DIST-A 213 325 2 1.9Y
Jun 01, 2014 DIST-A 213 294 2.0 1.8Y
May 01, 2014 DIST-A 219 278 1.8 1.8Y
Apr 01, 2014 DIST-A 210 282 1.8 1.7Y
Mar 01, 2014 DIST-A 213 260 2 1.7Y
Feb 01, 2014 DIST-A 210 226 2 1.7Y
Jan 01, 2014 DIST-A 210 237 2.1 1.6Y
Dec 01, 2013 DIST-A 210 240 2.3 1.6Y
Nov 01, 2013 DIST-A 213 243 2.3 1.5Y
Oct 01, 2013 DIST-A 213 291 2 1.4Y
Sep 01, 2013 DIST-A 225 386 1.0 1.4Y
Aug 01, 2013 DIST-A 216 276 1.3 1.4Y
Jul 01, 2013 DIST-A 210 286 1.3 1.4Y
Jun 01, 2013 DIST-A 210 242 1.4 1.4Y
May 01, 2013 DIST-A 210 273 1.4 1.3Y
Apr 01, 2013 DIST-A 210 266 1.5 1.4Y
Mar 01, 2013 DIST-A 210 243 1.5 1.4Y
Feb 01, 2013 DIST-A 210 226 1.5 1.4Y
Jan 01, 2013 DIST-A 210 253 1.5 1.4Y
Dec 01, 2012 DIST-A 210 238 1.4 1.4Y
Nov 01, 2012 DIST-A 210 231 1.3 1.4Y
Oct 01, 2012 DIST-A 216 304 1.2 1.4Y
Sep 01, 2012 DIST-A 210 0 1.4Y
Aug 01, 2012 DIST-A 210 0 1.4Y
Jul 01, 2012 DIST-A 213 2 1.2 1.4Y
Jun 01, 2012 DIST-A 213 1 0.9 1.4Y
May 01, 2012 DIST-A 213 1 1.65 1.4Y
Apr 01, 2012 DIST-A 213 1 1.6 1.4Y
Mar 01, 2012 DIST-A 210 0 1.4Y
Feb 01, 2012 DIST-A 216 276 1.5 1.4Y
Jan 01, 2012 DIST-A 210 297 1.5 1.4Y
Dec 01, 2011 DIST-A 210 291 1.5 1.4Y
Nov 01, 2011 DIST-A 210 318 1.2 1.4Y
Oct 01, 2011 DIST-A 210 0 0 1.4Y
Sep 01, 2011 DIST-A 210 314 1.3 1.3Y
Aug 01, 2011 DIST-A 219 358 1.3 1.3Y
Jul 01, 2011 DIST-A 213 280 1.3 1.2Y
Jun 01, 2011 DIST-A 213 327 1.3 1.2Y
May 01, 2011 DIST-A 210 313 1.4 1.2Y
Apr 01, 2011 DIST-A 210 256 1.3 1.2Y
Mar 01, 2011 DIST-A 210 306 1.5 1.2Y
Feb 01, 2011 DIST-A 213 246 1.5 1.2Y
Jan 01, 2011 DIST-A 210 258 1.5 1.2Y
Dec 01, 2010 DIST-A 210 265 1.4 1.2Y
Nov 01, 2010 DIST-A 210 252 1.3 1.2Y
Oct 01, 2010 DIST-A 222 248 1.1 1.2Y
Sep 01, 2010 DIST-A 216 289 0.12 1.2Y
Aug 01, 2010 DIST-A 222 337 1.2 1.3Y
Jul 01, 2010 DIST-A 216 294 1.2 1.3Y
Jun 01, 2010 DIST-A 219 327 1.2 1.3Y
May 01, 2010 DIST-A 210 277 1.3 1.4Y
Apr 01, 2010 DIST-A 213 298 1.4 1.2Y
Mar 01, 2010 DIST-A 210 359 1.4 1.2Y
Feb 01, 2010 DIST-A 210 275 1.4 1.2Y
Jan 01, 2010 DIST-A 210 274 1.5 1.2Y
Dec 01, 2009 DIST-A 213 280 1.4 1.2Y
Nov 01, 2009 DIST-A 213 270 1.2 1.2Y
Oct 01, 2009 DIST-A 228 319 1.3 1.2Y
Sep 01, 2009 DIST-A 216 292 1.2 1.2Y
Aug 01, 2009 DIST-A 219 309 1.2 1.2Y
Jul 01, 2009 DIST-A 223 6 1.2 1.2Y
Jun 01, 2009 DIST-A 213 1 1.8 1.3Y
May 01, 2009 DIST-A 210 210 1.2Y
Apr 01, 2009 DIST-A 210 279 1.4 1.3Y
Mar 01, 2009 DIST-A 210 296 1.4 1.4Y
Feb 01, 2009 DIST-A 210 251 1.4 1.4Y
Jan 01, 2009 DIST-A 210 263 1.4 1.4Y
Dec 01, 2008 DIST-A 210 262 1.4 1.4Y
Nov 01, 2008 DIST-A 210 234 1.3 1.4Y
Oct 01, 2008 DIST-A 210 291 1.2 1.4Y
Sep 01, 2008 DIST-A 210 281 1.2 1.4Y
Aug 01, 2008 DIST-A 210 277 1.3 1.4Y
Jul 01, 2008 DIST-A 210 347 1.4 1.4Y
Jun 01, 2008 DIST-A 210 288 1.4 1.4Y
May 01, 2008 DIST-A 210 277 1.4 1.3Y
Apr 01, 2008 DIST-A 210 329 1.4 1.4Y
Mar 01, 2008 DIST-A 210 307 1.5 1.3Y
Feb 01, 2008 DIST-A 210 266 1.5 1.3Y
Jan 01, 2008 DIST-A 210 287 1.4 1.3Y
Dec 01, 2007 DIST-A 210 284 1.4 1.4Y
Nov 01, 2007 DIST-A 210 242 1.2 1.4Y
Oct 01, 2007 DIST-A 210 338 1.2 1.4Y
Sep 01, 2007 DIST-A 210 269 1.2 1.4Y
Aug 01, 2007 DIST-A 210 333 1.2 1.4Y
Jul 01, 2007 DIST-A 210 0 1.4Y
Jun 01, 2007 DIST-A 210 307 1.3 1.4Y
May 01, 2007 DIST-A 210 337 1.4 1.4Y
Apr 01, 2007 DIST-A 210 314 1.4 1.4Y
Mar 01, 2007 DIST-A 0 322 1.5 1.4Y
Feb 01, 2007 DIST-A 210 281 1.5 1.4Y
Jan 01, 2007 DIST-A 210 308 1.5 1.4Y
Dec 01, 2006 DIST-A 1 271 1.4 1.3Y
Nov 01, 2006 DIST-A 1 315 1.3 1.3Y
Oct 01, 2006 DIST-A 0 320 1.3 1.3Y
Sep 01, 2006 DIST-A 15 276 1.3 1.3Y
Aug 01, 2006 DIST-A 210 358 1.3 1.3Y
Jul 01, 2006 DIST-A 210 289 1.3 1.3Y
Jun 01, 2006 DIST-A 210 340 1.3 1.4Y
May 01, 2006 DIST-A 210 331 1.4 1.4Y
Apr 01, 2006 DIST-A 210 305 1.3 1.4Y
Mar 01, 2006 DIST-A 210 340 1.3 1.4Y
Feb 01, 2006 DIST-A 210 288 1.3 1.4Y
Jan 01, 2006 DIST-A 210 309 1.3 1.4Y
Dec 01, 2005 DIST-A 210 297 1.5 1.4Y
Nov 01, 2005 DIST-A 210 326 1.3 1.4Y
Oct 01, 2005 DIST-A 210 325 1.3 1.4Y
Sep 01, 2005 DIST-A 210 308 1.4 1.4Y
Aug 01, 2005 DIST-A 210 364 1.4 1.4Y
Jul 01, 2005 DIST-A 210 281 1.4 1.4Y
Jun 01, 2005 DIST-A 210 303 1.4 1.4Y
May 01, 2005 DIST-A 210 319 1.3 1.3Y
Apr 01, 2005 DIST-A 210 299 1.5 1.4Y
Mar 01, 2005 DIST-A 210 354 1.4 1.3Y
Feb 01, 2005 DIST-A 210 283 1.3 1.3Y
Jan 01, 2005 DIST-A 210 287 1.4 1.3Y
Dec 01, 2004 DIST-A 210 314 1.4 1.3Y
Nov 01, 2004 DIST-A 210 288 1.3 1.3Y
Oct 01, 2004 DIST-A 210 288 1.3 1.3Y
Sep 01, 2004 DIST-A 210 301 1.2 1.2Y
 



More information for this water system: SDWIS ID 3900
System Info  ::  Report for Lenders  ::  Alerts  ::  Violations  ::  Compliance & Enforcement  ::  Contacts & Advisories  ::  Site Visits  ::  Public Notice
Coliform Summary  ::  Coliform Results  ::  Coliform Schedules  ::  LT2  ::  GW/GWUDI Source Details  ::  Plan Review  ::  Annual Fee
Chemical Summary  ::  Chemical Results  ::  Chemical Schedules  ::  Chemical Schedule Summary  ::  Arsenic RAA  ::  Cyanotoxins  ::  PFAS
Lead & Copper  ::  DBP Sample Sites  ::  FANLs  ::  MRDL  ::  GWR 4-Log  ::  Turbidity  ::  SWTR  ::  LRAA  ::  DW Source Protection
Information for all water systems:
Water System Inventory  ::  Water System Surveys  ::  Outstanding Performers  ::  Treatment Plant Inspections  ::  Treatment  ::  Plan Reviews
Alerts  ::  Violations  ::  Compliance & Enforcement  ::  Deficiencies  ::  System Scores  ::  Exceedances  ::  Public Notices  ::  Service Lines
Water Advisories  ::  Contact Reports  ::  Cyanotoxins  ::  PFAS  ::  Post-wildfire VOCs  ::  Fluoride  ::  Certification List  ::  DW Source Protection
Main menu:
Introduction  ::  Data Search Options  ::  Water System Search  ::  DWS Home  ::  DWS Rules
Need help? Email Drinking Water Services for assistance.Staff/Partner Login