Stage 1 Disinfectant/Disinfection Byproducts

What are Disinfection Byproducts?

Who Does Rule Apply To?

What is Required?

Assistance

What are Disinfection Byproducts?

Disinfection Byproducts (DBPs) are chemicals formed as a result of the reaction between chlorine added to the water (for disinfection) and naturally occurring organic material already present in the water.
Rule 62-550.514, Florida Administrative Code requires public water systems adding a chemical disinfectant to their water to comply with the requirements of 40 CFR 141, subpart L.

Who does this rule apply to?

Community and non-transient non-community public water systems which add chemical disinfection to their water at any point in the water treatment process.

What is required?

Suppliers of water must monitor:

1. Disinfectant Residuals

a. Required of systems with a population of 4,901 and greater:

i. A Disinfectant Residual Report must be submitted quarterly. Data for this report must be obtained from the same location and with the same frequency as compliance bacteriological sampling.

ii. It is important to only report disinfectant residuals from compliance samples and not from any other kind of bacteriological sample.

2. Stage 1 Disinfection Byproducts

a.    The first step to meeting this requirement is to complete a Disinfectant/Disinfection Byproducts Rule Monitoring Plan and have the Plan available for review during Department sanitary survey inspections and compliance inspections.

b.    Completion of this form will require the designation of a maximum residence time (MRT) location for each water treatment plant that serves the water system. This is a place in the distribution system where the water will have been in the distribution system for the longest time.

c.    Complete your regular sampling for Total Trihalomethanes and Haloacetic Acids Five (TTHMs/HAA5s), either quarterly, annually, or triennially in accordance with your plan.

d.    Systems with a population of 10,000 or greater must submit a Disinfectant Byproduct Report quarterly, or annually, depending on sampling frequency.   This report will indicate current DBP averages.

e.    Systems which ozonate must test for Bromate monthly (point of entry sample).

f.     Total Organic Carbon (TOC) and alkalinity monitoring is required monthly to demonstrate compliance with the treatment technique requirements for surface water systems that are using conventional filtration treatment.