Algae Bloom

What Algae Blooms Look Like in Practice

You’ll know you’ve got an algae bloom when your stormwater pond looks more like green soup than water. The surface gets covered in thick, slimy mats that smell like rotting fish on hot days. Sometimes it’s bright green, other times blue-green or even reddish-brown depending on the type of algae.

The bloom starts small but spreads fast. What looks like a little green tint on Monday can turn into a carpet of scum by Friday. Fish might start floating belly-up, and residents start calling with complaints about the smell.

Why Property Managers Should Care

Algae blooms don’t just look bad, they signal bigger problems. They mean your stormwater system isn’t working right. Too many nutrients are flowing in from fertilized lawns, pet waste, or eroding soil. The pond can’t process them naturally anymore.

Once a bloom takes hold, it creates a cycle that’s hard to break. Dead algae sinks to the bottom and decomposes, using up oxygen that fish need. This creates more nutrients, feeding more algae growth.

The smell alone will have your residents or tenants complaining. But there’s a bigger issue: some algae blooms are toxic. Blue-green algae can produce toxins that make people and pets sick if they touch the water.

What Triggers Algae Problems

Warm weather plus nutrients equals trouble. Summer heat accelerates growth, but the real culprit is nutrient loading. This happens when:

• Fertilizer runs off from landscaping
• Pet waste washes into the system
• Soil erosion brings in sediment rich in phosphorus
• Organic debris like grass clippings accumulates
• The pond is too shallow from sediment buildup

Stagnant water makes it worse. If your stormwater management system isn’t moving water properly, algae has more time to establish itself.

Compliance and Regulatory Issues

South Carolina’s stormwater regulations under the Clean Water Act require you to maintain your BMPs in working condition. A pond choked with algae isn’t functioning as designed. SCDHEC can cite you for inadequate maintenance.

Florida’s stormwater rules are even stricter about nutrient pollution. The state’s Total Maximum Daily Load (TMDL) requirements for nitrogen and phosphorus mean algae blooms can signal you’re not meeting water quality standards.

Georgia’s MS4 permits require regular inspection and maintenance of stormwater facilities. Chronic algae problems show you’re not keeping up with required maintenance schedules.

When to Call a Professional

Don’t wait until the bloom covers half your pond. Early intervention costs less and works better. Call for help if:

• Green tint appears and doesn’t clear after a few days
• You smell that distinctive rotting odor
• Fish are dying or acting sluggish
• Residents are complaining about water quality
• Your last inspection noted nutrient buildup

Sometimes the fix is simple maintenance like removing debris or improving circulation. Other times you need pond dredging to remove built-up sediment that’s releasing stored nutrients.

Professional treatment combines immediate algae control with long-term prevention. That means fixing the source of nutrients, not just treating the symptoms.