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| Introduction :: Data Search Options :: Water System Search :: DWS Home :: DWS Rules |
OHA Drinking Water Services
Contact Report Details |
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| PWS ID: | OR41 00609 | ||
| PWS Name: | PACIFIC CITY JOINT WATER - SAN AUTH | ||
| Who Was Contacted: | John Wesely | ||
| Contact Phone: | 503-801-0369 (Email address hidden) | ||
| Contact Date: | 11/20/2024 | ||
| Contacted By: | ALFAFARA, NICOLE (DWP) | ||
| Contact Method/Location: | Phone | ||
| Assistance Type: | WATER QUALITY ALERT RESPONSE | ||
| Reasons: | Disinfection Byproducts |
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| Details: | The system contacted DWS staff regarding an upcoming elevated HAA5 result of 0.0703 mg/L, exceeding the 0.060 mg/L MCL for HAA5. Discussions highlighted compliance is determined using the LRAA and OEL. With the elevated result, the current HAA5 LRAA will be 0.049 mg/L, and the OEL will be 0.058 mg/L—both below the MCL. While no immediate action is required, close monitoring is essential as the OEL is nearing the threshold and incorporates historical data. LRAA and HAA5 calculations were reviewed with system staff - The LRAA is calculated by averaging the last four quarters, updated each quarter by adding the newest result and dropping the oldest. OELs are determined by summing the results of the last two quarters, doubling the current quarter's result, and dividing by four. DWS staff sent a follow-up email on 11/25 to confirm discussion key points and provided an OEL report template for system reference. |
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| Associated Alerts: | DBP-101 - 11/21/2024 - TOTAL HALOACETIC ACIDS (HAA5) |
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