OHA Drinking Water Services
OHA Drinking Water Services
Contact Report Details
PWS ID: OR41 01062
PWS Name: RAINBOW ROCK VILLAGE MHP
 
Who Was Contacted: Brenda Vasquez
Contact Phone: (Email address hidden)
Contact Date: 04/09/2026
Contacted By: DOWNS, KENT (DWP)
Contact Method/Location: Email
 
Assistance Type: INCIDENT RESPONSE
Reasons: SWTR
Operations
 
Details: Cistern pump failure and Turbidity Event

04.09.2026 - The operator reported the following incident:

On 04/02/2026, the operator identified that the cistern pump was beginning to fail. While still operational, the pump was unable to meet system demand, and a replacement was ordered immediately. During the shipping lead time, reservoir levels dropped to a mid-low range. The new pump was delivered and installed on 04/08/2026. Following installation, the unit ran continuously to recover reservoir levels, which resulted in a brief period of elevated turbidity.

Corrective Actions: To mitigate turbidity, the operator transitioned to intermittent pumping to allow the cistern to recharge effectively. The system is expected to return to normal operation once the reservoir reaches full capacity and pumping cycles stabilize.

Water Quality Data and Compliance: The operator responded immediately to the turbidity spike by shutting the pump down for two hours. While turbidity peaked at 1.8 NTU, the duration was limited to one hour—below the four-hour regulatory threshold. Upon restarting, turbidity dropped to 0.6 NTU and has continued to decline.

Free chlorine concentration at the time when the pump began to fail was 0.86 mg/L, pH was 6.9, water temperature 15.3 ºC, actual CT 49.9 and required CT 25.3. This morning (04.09.2026), the chlorine concentration was recorded at 1.04 mg/L, turbidity is down to 0.2 NTU, pH is 6.78, water temperature 15.1 ºC, actual CT 60.3, and required CT 25.0.

Given that disinfection was maintained and the turbidity duration was limited, a Boil Water Advisory is not required at this time. The system has been instructed to continue monitoring turbidity levels closely and issue a Tier 2 Public Notice should the system experience a turbidity MCL violation (e.g., turbidity MCL exceeded in more than 5% of monthly samples, or a single sample exceeding the MCL of 1.49 NTU based on the 4-hour readings).