Level 1 assessments (L1As) are triggered for PWSs that are collecting fewer than 40 samples per month when two or more routine and/or repeat sample results show total coliforms are present in the same month. For PWSs collecting 40 or more samples each month, a L1A is triggered when greater than 5% of routine and/or repeat samples show total coliforms are present. L1As are also triggered if a PWS fails to take required repeat sample(s) after any single sample result shows total coliforms are present.
If a L1A is triggered, the PWS must notify RIDOH by the end of the day on which the PWS learns of the L1A trigger. Call the office at 401-222-6867 or email DOH.RIDWQ@health.ri.gov with a subject line including “L1A trigger,” the name of PWS, and the PWS ID number.
RIDOH will prepare a L1A trigger letter with directions for the PWS. L1As must be performed by the PWS or a knowledgeable third party within 10 calendar days of the date on the trigger letter from RIDOH. Free technical assistance is available upon request from RIDOH. RIDOH developed a L1A form workbook to ensure a thorough inspection of the PWS is conducted. The L1A form workbook is available in Microsoft Excel and PDF formats.