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OHA Drinking Water Services
Contact Report Details |
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| PWS ID: | OR41 00337 | ||
| PWS Name: | ROCK CREEK WATER DISTRICT | ||
| Who Was Contacted: | Mel Wheeler | ||
| Contact Phone: | 503-879-2681 (Email address hidden) | ||
| Contact Date: | 01/23/2025 | ||
| Contacted By: | HOFELD, EVAN (DWP) | ||
| Contact Method/Location: | |||
| Assistance Type: | VIOLATION RESPONSE | ||
| Reasons: | SWTR |
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| Details: | On January 23, 2025, I was alerted by DWS-DMCE that Rock Creek Water District did not meet disinfection requirements on multiple days in December (a Tier 2 violation requiring public notice within 30 days). Following the water system survey on December 19, 2024, it was discovered that they had still been using 226 minutes of contact time and not 91 minutes of contact time needed for disinfection that was determined from the most recent tracer study conducted May 18, 2022, by Civil West. At the time of the survey, I explained to Mel Wheeler that they needed to start using 91 minutes, but that they may need to increase their chlorine residual to make up for the shorter contact time. The December report used 91 minutes of contact time for the entire month, however, on the 22 days in December where the chlorine residual was less than 0.7 mg/l, the actual CT achieved did not meet the CT required (actual CT = contact time x chlorine residual). The chlorine residual ranged from 0.6 to 0.8 in December 2024, which was generally higher than the residual maintained in November 2024, but not sufficient to meet CT required using a contact time of 91 minutes. I called and spoke to Leonard Fisher at 503-879-5497 (the operator who signed the December report) about this and he said he understood the issue and would work to ensure the chlorine residual was sufficient. I asked Leonard to let Mel know to check his email as I emailed Mel on 1-23-25 an explanation of the violation and a link to a public notice template they could use. In the email, I also made some recommendations to check every day if actual CT was greater than or equal to CT required and to mark the "CT Met?" column with "yes" or "no" accordingly every day. I also recommended they increase the target entry point residual to 0.8 mg/l and to let Leonard know if the chlorine residual ever dropped below 0.8 mg/l so he can make necessary treatment adjustments if needed (0.8 mg/l x 91 min = actual CT of 72.8). | ||
| Associated Violations: | VIOLATION IS NOT IN SDWIS YET |
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