Aerobic Septic System: Complete Cost & Buyer’s Guide (2025)

You need a new septic system, but your property has challenging soil conditions, limited space, or high water table. Your contractor mentioned an “aerobic septic system” that costs nearly twice as much as a conventional system—but claims it’s worth every penny.

Or maybe you already have an aerobic system and you’re shocked by the maintenance requirements and ongoing costs that nobody warned you about.

Aerobic septic systems (also called Aerobic Treatment Units or ATUs) are fundamentally different from conventional septic systems. They’re more expensive to install, more complex to maintain, and require electricity—but they treat wastewater to a much higher standard and work in situations where traditional systems fail.

After analyzing installation data from across the country, interviewing septic professionals, and reviewing hundreds of aerobic system owner experiences, I’ve created this comprehensive guide to help you understand costs, benefits, drawbacks, and whether an aerobic system is right for your property.

Quick Cost Overview (2025)

National Average: $14,250
Typical Range: $10,500 – $18,000
Low End: $8,000 – $10,000 (basic system, easy installation)
High End: $20,000 – $30,000+ (complex system, difficult site)

Aerobic vs. Conventional Septic Costs:

System TypeInstallation CostAnnual Maintenance20-Year Total CostConventional Septic$3,500-$8,000$100-$300$5,500-$14,000Aerobic Septic (ATU)$10,500-$18,000$300-$600$16,500-$30,000

Key Difference: Aerobic systems cost 2-3x more upfront and have 3-6x higher maintenance costs.

Related: LINK: Septic System Maintenance – Maintenance requirements comparison

What Is an Aerobic Septic System?

The Basic Difference:

Conventional Septic Systems:

• Anaerobic (without oxygen)
• Bacteria break down waste slowly
• Produces partially-treated wastewater
• Requires large drain field
• Passive system (no electricity)

Aerobic Septic Systems:

• Aerobic (with oxygen)
• Bacteria break down waste rapidly
• Produces highly-treated wastewater
• Smaller drain field possible
• Active system (requires power)

How Aerobic Systems Work:

Step 1: Pre-Treatment Tank

• Wastewater enters first chamber
• Solids settle (like conventional tank)
• Pre-treated water moves to aerobic chamber

Step 2: Aeration Chamber

• Air pumped into wastewater continuously
• Aerobic bacteria thrive and multiply
• Bacteria consume organic matter rapidly
• Effluent becomes much cleaner

Step 3: Clarification

• Treated water settles in final chamber
• Remaining particles settle out
• Clear effluent ready for discharge

Step 4: Disinfection

• Chlorine tablets (most common)
• UV light (some systems)
• Kills remaining pathogens
• Produces near-potable water quality

Step 5: Distribution

• Pump disperses treated water
• Smaller drain field than conventional
• Surface irrigation possible (in some states)
• Minimal environmental impact

Key Components:

1. Multi-Chamber Tank ($3,000-$6,000)

• Typically 3 chambers
• 500-1,500 gallon capacity
• Concrete, fiberglass, or polyethylene

2. Aerator/Air Pump ($400-$1,200)

• Heart of the system
• Runs 24/7
• Lifespan: 5-7 years
• [AFFILIATE LINK] Replacement aerators available

3. Control Panel ($300-$800)

• Monitors system function
• Alarm system
• Timer controls
• Visual indicators

4. Disinfection System ($200-$600)

• Chlorine tablet dispenser (most common)
• UV chamber (premium option)
• Ensures pathogen elimination

5. Effluent Pump ($200-$500)

• Distributes treated water
• Pressurized discharge
• Lifespan: 5-10 years

6. Spray/Drip Irrigation (optional) ($1,500-$4,000)

• Surface distribution system
• Requires permit in most states
• Disperses treated water evenly

Detailed Cost Breakdown

Installation Costs by Component:

System Equipment: $6,000-$12,000

• Tank(s): $3,000-$6,000
• Aerator: $400-$1,200
• Control panel: $300-$800
• Pump: $200-$500
• Disinfection: $200-$600
• Piping/fittings: $500-$1,000

Labor & Installation: $3,000-$6,000

• Excavation: $1,000-$2,500
• System installation: $1,500-$3,000
• Electrical work: $500-$1,000
• Inspection/testing: $200-$500

Site Preparation: $500-$2,000

• Perc test: $200-$500
• Soil evaluation: $200-$500
• Survey/engineering: $300-$1,000

Permits: $200-$2,000

• Health department permit: $200-$1,000
• Electrical permit: $50-$200
• Construction permit: $100-$500
• Varies widely by location

Total Installation: $10,500-$18,000 typical

Factors Affecting Installation Cost:

1. System Size (Gallons Per Day)

• 1-2 bedrooms (500 GPD): $8,000-$12,000
• 3 bedrooms (600-800 GPD): $10,000-$15,000
• 4 bedrooms (1,000 GPD): $12,000-$18,000
• 5+ bedrooms (1,200+ GPD): $15,000-$25,000

2. Site Conditions

Easy Site: Flat, good soil, easy access

• Base pricing applies

Moderate Site: Some slope, average soil, decent access

• Add 10-20% ($1,000-$3,000)

Difficult Site: Steep slope, rocky soil, poor access, high water table

• Add 30-50% ($3,000-$8,000)

3. System Type/Brand

Basic Residential Systems: $6,000-$10,000 (equipment)

• Norweco Singulair
• Hydro-Action Multi-Flo
• Infiltrator AeroTech
• Delta Whitewater

Mid-Range Systems: $8,000-$12,000 (equipment)

• Norweco Hydro-Kinetic
• Jet Aeration
• Delta EnviroHome

Premium Systems: $10,000-$15,000+ (equipment)

• Advanced controls
• Enhanced treatment
• Commercial-grade components

4. Distribution Method

Subsurface Drip: $1,500-$3,500

• Most common
• Underground distribution
• Similar to conventional drain field

Spray Irrigation: $2,500-$5,000

• Above-ground dispersal
• Requires larger buffer zones
• May need additional permits

Direct Discharge (where allowed): Minimal cost

• Discharge to ditch, stream
• Rare – strict regulations
• Not allowed in most areas

5. Regional Labor Costs

Low Cost Regions (South, Rural): $40-$60/hour labor Average Regions (Midwest): $60-$80/hour labor High Cost Regions (Northeast, West Coast, Urban): $80-$120/hour labor

Impact on total installation: $1,000-$4,000 difference

Installation Timeline:

Planning Phase: 2-6 weeks

• Permits
• Engineering
• Scheduling

Installation: 3-5 days

• Excavation: 1 day
• Tank installation: 1-2 days
• Electrical/plumbing: 1 day
• Testing/startup: 1 day

Total Project Duration: 4-8 weeks from permit to completion

Annual Operating & Maintenance Costs

This is where aerobic systems get expensive compared to conventional systems.

Required Annual Maintenance: $300-$600

Service Contract: $250-$450/year (typical)

Most states REQUIRE professional maintenance 1-4 times per year:

Quarterly Service (Most Common):

• Visual inspection
• Air pump check
• Chlorine tablet replacement
• Control panel testing
• Sample testing
• Minor adjustments
• Cost: $75-$125 per visit = $300-$500/year

Semi-Annual Service:

• Same services, less frequent
• Cost: $125-$175 per visit = $250-$350/year

What’s Included in Service:

• System inspection
• Air pump/aerator check
• Effluent quality testing
• Chlorine dispenser maintenance
• Alarm testing
• Filter cleaning
• Minor repairs (often extra)

What’s NOT Included (Additional Costs):

• Major component replacement
• Pumping sludge tank ($300-$500 every 3-5 years)
• Parts beyond wear items
• Emergency repairs

Consumables & Operating Costs:

Chlorine Tablets: $50-$150/year [AFFILIATE LINK] HTH Septic Chlorine Tablets ($40-$60 for 6-month supply)

• Need continuous supply
• Replenished at each service visit
• DO NOT use pool chlorine tablets

Electricity: $15-$40/month = $180-$480/year

• Aerator runs 24/7
• Pumps run periodically
• Control panel
• Regional electricity costs vary

Total Annual Operating Cost: $530-$1,130

Over 20 years: $10,600-$22,600 in operating costs alone

Related: LINK: Septic Tank Pumping Cost – Compare maintenance expenses

Component Replacement Costs:

These eventually need replacing:

Aerator/Air Pump: Every 5-7 years

• Cost: $400-$1,200
• [AFFILIATE LINK] Norweco Singulair Aerator ($600-$900)
• [AFFILIATE LINK] Hiblow HP-80 Aerator ($400-$650)
• Labor: $100-$300

Effluent Pump: Every 5-10 years

• Cost: $200-$500
• [AFFILIATE LINK] Liberty Pumps Effluent Pump ($250-$400)
• Labor: $150-$300

Control Panel: Every 10-15 years

• Cost: $300-$800
• Labor: $150-$400

UV Bulb (if applicable): Every 12-18 months

• Cost: $80-$200
• [AFFILIATE LINK] Replacement UV bulbs
• Usually DIY-friendly

Chlorinator: Every 5-10 years

• Cost: $150-$400
• Labor: $100-$250

20-Year Total Cost of Ownership:

Installation: $10,500-$18,000
Annual Maintenance (20 years): $10,600-$22,600
Component Replacements: $2,000-$5,000
Sludge Pumping (4-5 times): $1,200-$2,500

Total 20-Year Cost: $24,300-$48,100

Compare to Conventional Septic (20 years):

• Installation: $3,500-$8,000
• Pumping only (6-7 times): $1,800-$3,500
• Total: $5,300-$11,500

Aerobic systems cost 3-5x more over 20 years.

When Aerobic Systems Are Required

Situations Where You NEED Aerobic:

1. Poor Soil Conditions

• Clay soil (slow percolation)
• Rocky soil
• Shallow bedrock
• Sandy soil (too fast percolation)

2. High Water Table

• Seasonal or permanent high groundwater
• Prevents conventional drain field function
• Aerobic system treats to higher standard

3. Small Lot Size

• Insufficient space for conventional drain field
• Aerobic allows smaller leach field
• Typical savings: 40-60% space

4. Proximity to Water

• Within 100 feet of lake, stream, well
• Environmental protection requirements
• Better treatment reduces contamination risk

5. Failed Conventional System

• Old system no longer functions
• No space for new conventional field
• Aerobic system fits in smaller footprint

6. Local Regulations

• Some counties require aerobic for new construction
• Environmentally sensitive areas
• Watershed protection zones

7. Surface Irrigation Needed

• Want to use treated water for lawn irrigation
• Reduces well water usage
• Requires aerobic-level treatment

When You DON’T Need Aerobic:

If you have: ✅ Good soil with proper percolation ✅ Adequate lot size for conventional system ✅ Low water table ✅ No environmental constraints ✅ Budget is primary concern

Stick with conventional septic – it’s cheaper and simpler.

Pros and Cons: Is It Worth It?

Advantages of Aerobic Systems:

1. Superior Treatment Quality

• Removes 90-98% of BOD (vs 40-60% conventional)
• Cleaner effluent
• Less environmental impact
• Near-potable water quality

2. Smaller Footprint

• Requires 50-70% less drain field area
• Works on small lots
• Preserves yard space

3. Works in Poor Conditions

• High water table OK
• Poor soil OK
• Challenging sites possible

4. Surface Irrigation Possible

• Use treated water for landscaping (where allowed)
• Reduces well water usage
• Visible water reuse

5. Better for Environment

• Less nitrogen/phosphorus discharge
• Protects lakes, streams, groundwater
• Reduces algae blooms

6. Faster Processing

• Treats waste in 1-2 days (vs 2-3 weeks conventional)
• Smaller tanks possible
• Quicker recovery after heavy use

Disadvantages of Aerobic Systems:

1. Much Higher Cost

• 2-3x installation cost
• 3-6x ongoing maintenance
• Major component replacements

2. Requires Electricity

• System fails without power
• Must run continuously
• Monthly electric bill increase
• Backup power recommended

3. Complex Maintenance

• Professional service required (most states)
• Quarterly visits mandatory
• Chlorine tablets needed continuously
• More things to break

4. Strict Regulations

• Service contracts often required by law
• Health department oversight
• Annual inspections
• Violation penalties

5. Mechanical Failures

• Aerator can fail (loud, obvious)
• Pumps fail
• Control panels malfunction
• Parts harder to source

6. Noise

• Aerator hum (usually not loud)
• Located outside often
• Can be annoying to some

7. Odor During Service

• When opened for maintenance
• Chlorine smell
• Usually brief

8. Homeowner Responsibility

• Must monitor alarm
• Ensure chlorine supply
• Schedule service
• Cannot ignore

Aerobic vs. Conventional: Side-by-Side

FactorConventional SepticAerobic Septic (ATU)Installation Cost$3,500-$8,000$10,500-$18,000Maintenance Cost/Year$100-$300$300-$600Electricity RequiredNoYes ($15-$40/month)Treatment QualityModerate (40-60% BOD removal)High (90-98% BOD removal)Drain Field Size800-1,500 sq ft typical400-800 sq ft typicalLifespan25-30 years20-25 years (components wear)Professional ServiceOptionalRequired (1-4x/year)ComplexitySimple (passive)Complex (active mechanical)Best ForNormal soil, adequate spacePoor soil, small lots, regulationsEnvironmental ImpactModerateLowOdorMinimalMinimal (chlorine smell when serviced)NoiseSilentSlight hum (aerator)20-Year Total Cost$5,300-$11,500$24,300-$48,100

Types of Aerobic Septic Systems

1. Fixed-Film Systems

How They Work:

• Media in aeration chamber (plastic, textile)
• Bacteria colonize media surface
• Wastewater flows over/through media
• Aerobic bacteria digest organics

Brands:

• Norweco Singulair (most popular)
• Jet Inc. Aeration
• Multi-Flo

Pros: ✅ Proven technology (50+ years) ✅ Robust ✅ Less sensitive to usage fluctuations

Cons: ❌ Bulkier ❌ Heavier (shipping costs) ❌ Media can clog over time

Cost: $6,000-$12,000 (equipment)

Recommended Product: [AFFILIATE LINK] Norweco Singulair TNT – Most popular residential ATU

2. Suspended-Growth Systems

How They Work:

• No fixed media
• Bacteria suspended in wastewater
• Continuous aeration
• Clarifier separates bacteria from effluent

Brands:

• Clearstream Wastewater Systems
• Bionest
• Delta Whitewater

Pros: ✅ Compact ✅ Lighter weight ✅ Efficient treatment ✅ Lower initial cost

Cons: ❌ More sensitive to usage changes ❌ Requires consistent loading ❌ More precise maintenance

Cost: $5,000-$10,000 (equipment)

3. Continuous Flow Systems

How They Work:

• Wastewater flows continuously through system
• No batch treatment
• Constant aeration
• Ongoing clarification

Most Common Type: Used in majority of residential systems

Pros: ✅ Simple operation ✅ Handles variable flows well ✅ Easier maintenance

Cons: ❌ Always running (continuous electricity)

4. Batch (Sequencing) Systems

How They Work:

• Treats wastewater in batches
• Fill → Aerate → Settle → Discharge → Repeat
• More complex controls

Pros: ✅ Very high treatment quality ✅ Efficient

Cons: ❌ More complex ❌ More expensive ❌ Less common

Cost: $8,000-$15,000 (equipment)

Major Brands Compared

Norweco Singulair

Most Popular Residential ATU in USA

Models:

• Singulair 960: 500 GPD (1-2 bedrooms)
• Singulair 1060: 600 GPD (3 bedrooms)
• Singulair TNT: 1,000 GPD (4-5 bedrooms)

Cost: $7,000-$12,000 (equipment + installation)

Pros: ✅ Proven reliability (60+ years in business) ✅ Extensive dealer network ✅ Parts widely available ✅ Excellent support

Cons: ❌ Higher cost than competitors ❌ Proprietary components

[AFFILIATE LINK] Norweco Replacement Parts – Aerators, pumps, chlorinators

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Jet Inc.

Popular in Southern/Southwestern USA

Models:

• Jet 500 series
• Jet 700 series
• Jet 1500 series

Cost: $6,000-$10,000 (equipment + installation)

Pros: ✅ Good value ✅ Reliable ✅ Lower maintenance costs

Cons: ❌ Less common in some regions ❌ Fewer dealers

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Hydro-Action Multi-Flo

Budget-Friendly Option

Cost: $5,500-$9,000 (equipment + installation)

Pros: ✅ Lower cost ✅ Simple design ✅ Easy maintenance

Cons: ❌ Fewer features ❌ Basic controls

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Delta Whitewater / EnviroHome

Premium Systems

Cost: $8,000-$14,000 (equipment + installation)

Pros: ✅ Advanced treatment ✅ Modern controls ✅ Aesthetic design

Cons: ❌ Higher cost ❌ More complex

[AFFILIATE LINK] Delta EnviroHome Systems

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BioMicrobics MicroFAST

Compact Textile-Based System

Cost: $6,500-$11,000 (equipment + installation)

Pros: ✅ Very compact ✅ Lightweight ✅ Efficient

Cons: ❌ Textile media must be replaced eventually ❌ Less common

Installation Process

Step 1: Evaluation & Design (2-4 weeks)

Soil Testing:

• Percolation test
• Soil composition analysis
• Water table assessment
• Cost: $200-$800

Engineering:

• System sizing
• Specifications
• Site plan
• Cost: $500-$1,500

Permits:

• Health department approval
• Construction permits
• Electrical permits
• Cost: $200-$2,000
• Timeline: 2-6 weeks

Step 2: Excavation (1 day)

Tasks:

• Mark utilities
• Excavate tank location
• Excavate drain field
• Trench for piping

Cost: $1,000-$2,500

Step 3: Tank Installation (1-2 days)

Tasks:

• Set tank(s)
• Level and secure
• Connect plumbing
• Backfill around tank

Cost: $1,500-$3,000 (labor)

Step 4: Electrical (1 day)

Tasks:

• Run power to system
• Install control panel
• Wire aerator, pumps
• Test all components

Cost: $500-$1,000

Step 5: Drain Field (1 day)

Tasks:

• Install distribution system
• Lay pipe or drip lines
• Add aggregate/soil
• Grade and restore

Cost: $1,000-$3,000

Step 6: Startup & Testing (1 day)

Tasks:

• Fill tank with water
• Start aerator
• Check all functions
• Test alarms
• Add initial chlorine
• Final inspection

Cost: $200-$500

Total Installation Time: 3-5 days work, 4-8 weeks total project

Maintenance Requirements

Homeowner Responsibilities:

Weekly: ☐ Check control panel (green light on) ☐ Verify aerator running (slight hum) ☐ Check for alarms

Monthly: ☐ Inspect chlorine tablet level ☐ Add chlorine if needed [AFFILIATE LINK] ☐ Check for unusual odors ☐ Verify effluent pump operation (if accessible)

Quarterly (Professional Service): ☐ Schedule maintenance visit ☐ Technician performs inspection ☐ Testing performed ☐ Report provided

Annually: ☐ Review system performance with technician ☐ Budget for any recommended repairs ☐ Consider sludge pumping if needed

Professional Service Checklist:

What Technician Does:

✅ Measure sludge/scum levels ✅ Test dissolved oxygen ✅ Check aerator function ✅ Inspect control panel ✅ Test effluent quality (some visits) ✅ Replace/add chlorine tablets ✅ Check pumps ✅ Clean filters/screens ✅ Test alarm system ✅ Document findings ✅ Provide report to health department (if required)

Service Contract Options:

Basic Contract: $250-$350/year

• 2 visits per year
• Basic inspection
• Chlorine included
• Report to health department

Standard Contract: $350-$450/year

• 4 visits per year (quarterly)
• Full inspection each visit
• Chlorine included
• Effluent testing
• Minor adjustments
• Priority service

Premium Contract: $500-$700/year

• 4 visits per year
• Everything in standard
• All chlorine for year
• One sludge pumping included
• Emergency service included
• Discounted repairs

Recommendation: Standard contract meets most state requirements and provides adequate oversight.

Common Problems & Repairs

Problem 1: Aerator Failure

Symptoms:

• Alarm sounding
• No hum from aerator
• Sewage smell

Cause: Worn out motor (5-7 year lifespan typical)

Cost:

• New aerator: $400-$1,200
• Labor: $100-$300
• Total: $500-$1,500

[AFFILIATE LINK] Replacement aerators for all major brands

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Problem 2: Alarm Activation

Symptoms:

• Alarm light/sound
• May or may not have issue

Causes:

• High water level (pump failure, excessive water use)
• Aerator failure
• Power outage reset
• False alarm (float switch)

Cost:

• Service call: $100-$200
• Repair: $0-$500 depending on cause

Important: Never ignore alarms – call service provider

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Problem 3: Effluent Pump Failure

Symptoms:

• High water level alarm
• No discharge to drain field
• Backup possible

Cost:

• Pump replacement: $200-$500
• Labor: $150-$300
• Total: $350-$800

[AFFILIATE LINK] Liberty Pumps, Zoeller, Myers effluent pumps

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Problem 4: Chlorinator Issues

Symptoms:

• Tablets not dissolving
• Effluent not disinfected (fails test)
• Odor from discharge

Cost:

• Chlorinator replacement: $150-$400
• Labor: $100-$250
• Total: $250-$650

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Problem 5: Control Panel Failure

Symptoms:

• No power to system
• Intermittent operation
• Alarm malfunctions

Cost:

• Panel replacement: $300-$800
• Labor: $150-$400
• Total: $450-$1,200

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Problem 6: Tank Structural Issues

Symptoms:

• Cracks
• Leaks
• Settling

Cost:

• Minor repair: $500-$1,500
• Major repair: $2,000-$5,000
• Replacement: $5,000-$12,000

Prevention: Proper installation, avoid driving over tank

State Regulations & Requirements

Aerobic systems are heavily regulated. Requirements vary by state:

Common Requirements:

Maintenance Contracts:

• Required in: TX, OK, AR, LA, FL, and others
• Frequency: 1-4 times per year
• Must be licensed provider

Permits:

• Health department approval required
• Annual or biennial renewal (some states)
• Inspections required

Effluent Testing:

• BOD, TSS, chlorine residual
• Frequency varies (quarterly to annual)
• Reports to health department

Service Records:

• Must maintain for 3-10 years
• Available for inspection
• Transferred with property sale

Homeowner Education:

• Some states require certification course
• Manual provided
• Understand operation/responsibilities

Penalties for Non-Compliance:

• Fines: $100-$5,000
• System shutdown orders
• Mandatory repairs/upgrades

State-Specific Notes:

Texas: Very strict – quarterly service mandatory, detailed regulations

Oklahoma: Requires maintenance, but less prescriptive

Florida: Strict in some counties, varies widely

California: Performance-based standards, engineering required

Check your local health department for specific requirements in your area.

Financing Options

Payment Methods:

Cash/Check:

• Often 3-5% discount for cash payment
• Savings: $300-$900 on $10,000-$18,000 system

Contractor Financing:

• Many installers offer payment plans
• Rates: 6-12% APR typical
• Term: 12-60 months
• Approval required

Home Equity Loan:

• Lower rates (5-8% currently)
• Tax deductible interest (consult CPA)
• Uses home as collateral

Personal Loan:

• No collateral required
• Rates: 8-15% typical
• Online lenders, credit unions

USDA Loans (Rural Properties):

• Section 504 Home Repair Loans
• Very low interest (1%)
• Must qualify (income limits)
• Rural areas only

State/Local Programs:

• Some areas offer septic system loans/grants
• Low or zero interest
• Check with county health department

Sample Financing Comparison:

$15,000 System

Option 1: Cash payment

• Total: $15,000

Option 2: Contractor financing (9% APR, 48 months)

• Monthly: $373
• Total: $17,904
• Extra cost: $2,904

Option 3: Home equity (6% APR, 60 months)

• Monthly: $290
• Total: $17,400
• Extra cost: $2,400 (but tax deductible)

Option 4: USDA Loan (1% APR, 60 months)

• Monthly: $258
• Total: $15,480
• Extra cost: $480

DIY Installation: Possible?

Short Answer: Not Recommended

Why DIY Is Very Difficult:

❌ Complex electrical work required ❌ Precise specifications needed ❌ Permits require licensed contractors (most areas) ❌ Warranty requires professional installation ❌ Health department won’t approve ❌ One mistake = system failure ❌ Not cost-effective (equipment costs similar, can’t save much)

What Homeowners CAN Do:

✅ Prepare site (clear vegetation) ✅ Assist with excavation if you have equipment ✅ Provide access and materials staging ✅ Coordinate contractors ✅ Do your own landscaping restoration

Savings: $500-$1,500 maximum

Not Worth the Risk for most homeowners. Leave to professionals.

Buying a Home With Aerobic Septic

What to Check:

1. Service Records

• Request last 2-3 years of service reports
• Verify quarterly maintenance performed
• Check for recurring issues

2. Age of Components

• When was aerator last replaced?
• Pump age?
• Control panel age?
• Budget for replacements if old

3. Compliance Status

• System permitted?
• Current with inspections?
• Any violations?

4. Test System

• Have inspector verify operation
• Check effluent quality if possible
• Alarm test