Florida Treatment Plant Classification, Staffing & Operator Coverage

Florida treats individual operator licensing and facility classification as two related but separate systems.

An operator license tells you the certification level held by the person. A facility classification tells you the staffing level and operator coverage required for the treatment plant or distribution system.

Chapter 62-699 Controls Facility Classification and Staffing

Florida Administrative Code Chapter 62-699 establishes treatment plant and distribution system classification and minimum staffing requirements.

For exam preparation, keep the distinction clear:

• Chapter 62-602 primarily governs certification of individual operators.
• Chapter 62-699 primarily governs classification and staffing of facilities and systems.

Facility Classification Is Not the Operator License

A Class B operator and a Class B plant are not the same thing.

The operator class describes the individual's credential. The plant class describes the facility's regulatory classification and the level of certified operator coverage required.

The same distinction applies to water distribution system levels.

Florida Uses Process Category Plus Capacity

For treatment plants, Florida classification generally uses a two-step method:

1. determine the treatment process category;
2. use plant capacity within that category to determine the plant classification and staffing requirement.

The process category matters because more complex treatment processes can place a facility in a higher category than simpler processes.

Drinking Water Treatment Plant Categories

Florida water treatment plants are divided into process categories.

Examples include:

• Category I: conventional filtration, including coagulation, flocculation, sedimentation and rapid-rate granular-media filtration, and certain direct filtration applications;
• Category II: membrane processes such as microfiltration, ultrafiltration, nanofiltration and reverse osmosis;
• Category III: processes such as activated alumina, certain carbon adsorption, ion exchange for primary contaminants, oxidation and filtration for primary contaminants, and slow sand filtration;
• Category IV: certain secondary-contaminant treatment, chloramination, chlorine dioxide, ion exchange for hardness or secondary contaminants, and ozonation;
• Category V: simpler processes such as aeration, pH adjustment, chlorination, corrosion inhibitor addition, fluoridation, sequestration and ultraviolet radiation.

Highest Applicable Water Treatment Category Controls

Where a plant uses more than one treatment process, the plant category is determined by the highest applicable category containing one or more of the plant's category-determining treatment processes.

Category I is the highest water treatment category and Category V is the lowest.

Water Plant Capacity Determines Class Within the Category

After the treatment category is identified, Florida uses the permitted maximum-day operating capacity to determine whether the water treatment plant is classified as Class A, B, C, or D where that class is available for the category.

Class A is the highest possible water treatment plant classification and Class D is the lowest.

Example: Category I Water Treatment Plants

For Category I water treatment plants under the current adopted rule:

• 5.0 MGD and above is Class A;
• 1.0 MGD up to 5.0 MGD is Class B;
• less than 1.0 MGD falls within Class C staffing ranges;
• Class D is not applicable to Category I plants.

The exact minimum staffing hours within a Class C range depend on plant capacity.

Example: Category V Water Treatment Plants

Category V covers simpler treatment processes and allows lower classifications at smaller facilities.

Under the current adopted rule:

• larger Category V facilities can require Class C staffing;
• smaller Category V facilities can fall into Class D staffing ranges;
• the required operator visit frequency decreases as permitted capacity decreases.

This illustrates an important principle: treatment process complexity and plant capacity both affect staffing.

Domestic Wastewater Treatment Plant Categories

Florida also classifies domestic wastewater treatment plants by treatment process category.

Examples include:

• advanced nutrient-removal and membrane treatment processes;
• activated sludge processes other than extended aeration;
• extended aeration and oxidation ditches;
• trickling filters and rotating biological contactors;
• other defined treatment process categories.

Wastewater Example: Extended Aeration

Extended aeration, including oxidation ditches, is listed as a specific domestic wastewater treatment category.

Under the current adopted rule, larger extended-aeration plants can be classified as Class A or Class B, while smaller plants can fall into Class C or Class D staffing ranges.

This is one reason an operator should never determine staffing only from plant flow without first identifying the treatment process category.

Minimum Staffing Increases With Plant Class

Higher-class facilities require more operator coverage.

Current adopted Chapter 62-699 commonly uses patterns such as:

• Class A treatment plants: continuous or near-continuous required staffing by Class C or higher operators, with a Class A lead/chief operator;
• Class B treatment plants: extended daily staffing by Class C or higher operators, with a Class B or higher lead/chief operator;
• Class C treatment plants: scheduled daily or weekly staffing based on plant size and treatment category, with a Class C or higher lead/chief operator;
• Class D treatment plants: periodic required visits by a Class D or higher operator where Class D classification is permitted.

Class A and Class B Staffing Pattern

Many Class A treatment plant categories require staffing by a Class C or higher operator 24 hours per day, 7 days per week, with the lead/chief operator meeting the Class A requirement.

Many Class B treatment plant categories require staffing by a Class C or higher operator 16 hours per day, 7 days per week, with the lead/chief operator meeting the Class B or higher requirement.

Operators should verify the exact table for the specific treatment category because not every category has identical thresholds.

Class C Staffing Depends on the Table

Class C treatment plant staffing is not one universal number.

Depending on the process category and capacity, the adopted rule can require:

• several hours per day on weekdays plus weekend visits;
• shorter daily staffing periods;
• a defined number of visits per week;
• specific weekend coverage.

This is why memorizing a single generic Class C staffing rule is unsafe.

Class D Staffing Uses Required Visits

Where Class D classification is allowed, the adopted rule often uses required visits rather than full daily staffing shifts.

The rule can specify:

• number of visits per week;
• nonconsecutive visit days;
• minimum total weekly staffing time;
• a maximum interval between visits.

Lead/Chief Operator Requirement

Florida staffing rules identify a required lead/chief operator class for the facility.

The lead/chief operator requirement is tied to the facility classification and is separate from the class of operators providing routine required staffing.

For example, a Class A plant can be staffed during required shifts by Class C or higher operators while still requiring a Class A lead/chief operator.

Operator in Charge During Required Staffing

At Class A, B, and C treatment plants, the current adopted rule requires a licensed Class C or higher operator to be onsite and in charge during each required staffing shift when the lead/chief operator is not onsite.

This distinction is important:

• the lead/chief operator does not necessarily have to be physically present every minute of every required staffing period;
• the required onsite operator still must meet the minimum certification level for that shift.

Lead/Chief Operator Must Be Available

The current adopted rule requires an operator meeting the lead/chief operator class for the treatment plant to be available during all periods of plant operation.

For this rule, available means able to be contacted as needed to initiate appropriate action in a timely manner.

Class B Staffing Must Cover Peak Operating Periods

For Class B domestic wastewater and water treatment plants, the adopted rule requires the 16 hours per day of staffing to occur during the 16-hour period, or two 8-hour periods, of greatest influent flow or water production.

The purpose is to place qualified operator coverage during the facility's most operationally significant periods.

Daily Checks at Smaller Wastewater Plants

The additional staffing rule requires a daily check of each Class C or D domestic wastewater treatment plant by the permittee or representative each day the plant operates, or five days per week, whichever is less.

This daily-check requirement is separate from the minimum certified-operator staffing table.

Water Distribution System Classification

Florida also classifies water distribution systems.

The distribution system classification process uses two major factors:

1. the highest classification of the water treatment plant connected to the distribution system;
2. the number of persons directly served by the distribution system.

Level 1 is the highest possible distribution system classification and Level 4 is the lowest.

Distribution System Class and Operator License Level Are Related but Different

A Level 2 distribution operator license is an individual credential. A Level 2 distribution system classification describes the regulated system.

The system classification determines staffing requirements and the required lead/chief operator level.

Capacity and Population Are Not Interchangeable

Treatment plant classification is primarily tied to treatment process and permitted capacity.

Distribution system classification uses the connected treatment plant classification and population served.

Operators should not apply a treatment-plant MGD table to a distribution system or a distribution population table to a treatment plant.

Additional Staffing Requirements Can Apply

Chapter 62-699.311 contains additional requirements beyond the basic classification tables.

These include requirements related to:

• lead/chief operator availability;
• onsite operator coverage during required shifts;
• daily checks at certain smaller wastewater plants;
• timing of required Class B staffing;
• staffing reductions under specific conditions;
• other facility-specific operating circumstances.

Staffing Reductions Are Not Automatic

Florida rules contain provisions under which some staffing requirements can be reduced in specific circumstances.

Operators should not reduce staffing simply because a facility has been operating well. Any reduction must meet the applicable regulatory conditions and, where required, receive Department approval.

Variances Are Facility-Specific

Florida has granted individual variances from certain Chapter 62-699 staffing requirements in specific cases.

A variance issued to one utility does not become a general statewide rule for every facility.

Exam answers should be based on the adopted rule unless the question explicitly describes a facility-specific variance.

Current 2026 Rulemaking

As of 2026, FDEP is developing amendments to Chapter 62-699 related in part to distributed wastewater treatment systems.

The published draft and workshop materials are part of rule development. They should not be treated as adopted requirements until the rulemaking process is completed and an effective rule is published.

Operators should therefore distinguish:

• current adopted Chapter 62-699 requirements;
• proposed draft changes under active rulemaking.

Why Facility Classification Matters to Operators

Facility classification affects:

• required lead/chief operator class;
• minimum onsite operator coverage;
• required staffing hours;
• required visit frequency;
• availability requirements;
• who may be in charge during required staffing periods.

Common Classification and Staffing Mistakes

• Confusing the operator's license class with the plant's facility class.
• Determining plant classification from capacity without first identifying the treatment process category.
• Assuming all Class C plants have the same staffing hours.
• Assuming the lead/chief operator must personally be onsite during every required staffing hour.
• Ignoring the minimum certification level of the operator in charge during a required shift.
• Applying water treatment plant tables to wastewater plants.
• Applying treatment plant capacity rules to distribution system classification.
• Treating a facility-specific variance as a statewide rule.
• Treating a proposed 2026 draft amendment as if it were already adopted.

A Practical Classification Review

1. Identify whether the facility is a water treatment plant, wastewater treatment plant, or distribution system.
2. Identify the treatment process category where applicable.
3. Identify permitted operating capacity or population served, as required by the rule.
4. Use the correct Chapter 62-699 table to determine facility classification.
5. Identify minimum staffing hours or visit frequency.
6. Identify the required lead/chief operator class or level.
7. Check the additional staffing requirements in Rule 62-699.311.
8. Do not assume a variance or proposed draft applies unless the question specifically says so.

What to Remember for the Exam

• Chapter 62-699 governs treatment plant and distribution system classification and staffing.
• Chapter 62-602 governs individual operator certification; the two systems are related but not the same.
• Treatment plant classification uses treatment process category plus permitted capacity.
• Water treatment Category I is the highest category and Category V is the lowest.
• Class A is the highest treatment plant classification and Class D is the lowest where Class D is available.
• Higher-class facilities require greater operator coverage.
• Many Class A plants require 24-hour staffing by Class C or higher operators and a Class A lead/chief operator.
• Many Class B plants require 16 hours per day of staffing by Class C or higher operators and a Class B or higher lead/chief operator.
• Class C staffing varies by treatment category and capacity.
• Class D staffing commonly uses required visit schedules at smaller facilities.
• The lead/chief operator and the onsite shift operator can have different minimum certification requirements.
• Water distribution system classification uses connected plant classification and population served.
• Facility-specific variances do not replace the general statewide rule.
• 2026 proposed amendments to Chapter 62-699 are not adopted requirements until rulemaking is completed.