Water Treatment Exam Prep 2026

Calculate chlorine dosage instantly. Verify CT disinfection.Convert flow rates. State-specific content for all 50 states.1000+ questions.Pass your operator certification.

WATER TREATMENT PREP: CALCULATE. VERIFY. PASS.

The only water operator exam prep app with real plant calculators. Chlorine dosage, CT disinfection, chemical feed rates — tools you'll use every day on the job.

ALL 50 STATES SUPPORTED

Select your state. Get content specific to your certification.

• California SWRCB (D1-D5, T1-T5)
• Texas TCEQ (Class A-D)
• New York DOH (Levels 1A-4A)
• Florida DEP (Class A-C)
• All other states with standard levels

Federal EPA content applies everywhere. State-specific regulations where they matter.

CHLORINE DOSAGE CALCULATOR

The #1 calculation on every exam. The tool you'll use daily at the plant.

Enter:

• Flow rate (MGD, GPM, or GPD)
• Target dose (mg/L)
• Chlorine type (gas, hypo 12.5%, calcium hypo)

Get:

• Pounds per day for gas chlorine
• Gallons per day for liquid hypo
• Step-by-step formula breakdown

lbs/day = MGD × mg/L × 8.34

Never miss a dosage calculation again.

CT DISINFECTION CALCULATOR

EPA requires adequate CT for pathogen inactivation. Calculate and verify.

Enter:

• Disinfectant residual (mg/L)
• Contact time (minutes)
• Temperature and pH

Get:

• CT value achieved
• Required CT for Giardia
• Pass/fail determination
• Log inactivation achieved

CT = Concentration × Time

Know instantly if you're compliant.

CHEMICAL FEED RATE CALCULATOR

Set your feed pumps correctly. Calculate rate from dose and flow.

Works for:

• Sodium hypochlorite
• Alum and polymers
• Fluoride
• Soda ash
• Any chemical with known strength and SG

Output in GPD, GPH, or mL/min. Calculate pump stroke percentage.

FLOW RATE CONVERTER

Water industry uses multiple units. Convert instantly.

• MGD ↔ GPM ↔ GPD
• CFS ↔ GPM ↔ MGD
• Liters per second
• Cubic meters per day

1 MGD = 694.44 GPM = 1.547 CFS

Tap any value, see all conversions.

DETENTION TIME CALCULATOR

Calculate how long water stays in tanks and basins.

Enter tank dimensions. Get volume in gallons and cubic feet. Enter flow rate. Get detention time in minutes and hours.

Works for rectangular tanks, cylindrical tanks, and pipes.

480+ PRACTICE QUESTIONS

Math & Calculations

• Dosage problems with 8.34
• Flow conversions
• Detention time
• Volume calculations

Disinfection

• CT requirements
• Chlorine chemistry
• DBP formation
• UV disinfection

Water Quality

• MCLs for all contaminants
• Sampling requirements
• Test procedures

Treatment Processes

• Coagulation and flocculation
• Sedimentation
• Filtration types
• Process troubleshooting

Plus: Distribution systems, safety, federal regulations, state regulations, operations, laboratory procedures

STATE-SPECIFIC CONTENT

California: SWRCB regulations, Title 22, D/T certification levels Texas: TCEQ requirements, 30 TAC Chapter 290 New York: DOH regulations, Level 1A-4A system Florida: DEP rules, Class A-C system All states: Federal EPA requirements apply

WHO NEEDS THIS APP

• Water treatment plant operators
• Wastewater operators
• Distribution system operators
• Utility workers seeking certification
• Anyone recertifying (every 2-3 years)

175,000 operators nationwide. Aging workforce means constant new operators entering.

FREE TO START

5 questions per day free. Calculators in demo mode.

PRO - TRY FREE FOR 3 DAYS

Start your free trial. Get full access immediately.

Full access includes:

• Unlimited practice questions
• All five calculators
• State-specific content
• Exam simulator
• Progress tracking
• All reference materials

CALCULATE. VERIFY. PASS.

The exam costs $100-200. The tools pay for themselves on your first day at the plant.

This app is for educational purposes only. Certification requirements vary by state. Check with your state certifying agency for specific requirements.

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