SwimZone

Lake · Mahoning County · OH

Is Evans Lake safe to swim?

Clear to swim

No advisory or algae bloom reported for this water today.

Updated July 22, 2026 · EPA CyAN satellite

Recent rain
0.3 in
Water type
Lake
Last updated
Jul 22
Bacteria
E. coli, fecal
Not monitored
Tested
Not monitored

No bacteria advisory or sampling for this water.

Blue-green algae
cyanobacteria
Clear to swim
Tested
None detected
Advisory over
100,000
cells/mL

Cyanobacteria No cyanobacteria bloom detected by satellite (below detection limit), imaged 2026-07-21.

Sampled Jul 21 · EPA CyAN satellite

SwimZone for iPhone · launching soon

Evans Lake is clear today. Be the first to know when it's not.

SwimZone checks this water every day and pings you the moment a bacteria or algae advisory goes up.

What's in the water at Evans Lake right now

As of July 22, 2026, Evans Lake in Mahoning County, Ohio is clear to swim. Satellite imagery detected no blue-green algae bloom as of July 21, 2026. Rainfall over the past week totaled 0.3 in, which can wash bacteria and nutrients into the water.

How this read is built

Blue-green algae at Evans Lake

Evans Lake is a lake in Mahoning County, Ohio covering about 0.9 sq mi, the 31st-largest of the 41 lakes SwimZone monitors in Ohio. Satellite imagery detected no blue-green algae bloom as of July 21, 2026.

Blue-green algae (cyanobacteria) blooms are most common from midsummer into early fall, when the water is warm, calm, and rich in nutrients from runoff. They can produce toxins that make people sick and can be rapidly fatal to dogs, so skip water that looks green, scummy, or like spilled paint, and keep children and pets out of it.

Bloom history at Evans Lake

From EPA CyAN's satellite archive

2020: peak 855,112 cells/mL — above the 100,000 advisory level202021: peak 458,124 cells/mL — above the 100,000 advisory level212022: peak 169,740 cells/mL — above the 100,000 advisory level222023: peak 1,013,778 cells/mL — above the 100,000 advisory level232024: peak 558,757 cells/mL — above the 100,000 advisory level242025: peak 1,689,285 cells/mL — above the 100,000 advisory level252026: peak 184,817 cells/mL — above the 100,000 advisory level26Advisory100k cells/mL

Each bar is that summer's peak satellite reading (log scale). The red cap is the part above the advisory level.

Over 7 summers of satellite monitoring since 2020, Evans Lake has reached blue-green algae advisory levels in 7 of them, most recently in June 2026. This is a lake that blooms most summers. Its highest recorded reading was 1,689,285 cells/mL in September 2025.

When to swim at Evans Lake

It is currently peak season for blue-green algae, when warm, calm water lets blooms form fastest. This lake has bloomed in most monitored summers (7 of 7), historically peaking around September. Early summer, before the water fully warms, has generally been the safer window here; check the current read before you go either way.

Frequently asked: swimming in Evans Lake

Is it safe to swim in Evans Lake right now?
Evans Lake is clear to swim today. Satellite imagery detected no blue-green algae bloom as of July 21, 2026. Conditions can change quickly with wind, heat, and rain, so check the posted signs and look at the water before you get in.
Does Evans Lake have blue-green algae (cyanobacteria)?
No blue-green algae bloom is detectable at Evans Lake as of July 21, 2026 (below the satellite's roughly 10,000 cells/mL detection limit). Cyanobacteria can still appear within hours in warm, calm, nutrient-rich water, so look before you swim.
Can dogs swim in Evans Lake?
No bloom is detected at Evans Lake today, but dogs are much more vulnerable to blue-green algae than people, and blooms can form within hours. Always keep dogs away from water that looks green, scummy, or discolored, and rinse them off after swimming.
How often does Evans Lake have blue-green algae blooms?
Over 7 summers of satellite monitoring since 2020, Evans Lake has reached blue-green algae advisory levels in 7 of them, most recently in June 2026. This is a lake that blooms most summers. Its highest recorded reading was 1,689,285 cells/mL in September 2025.
How many Ohio lakes and beaches are unsafe for swimming today?
Today, 33 Ohio waters are above a safe-contact threshold and 32 more warrant caution, out of 101 monitored waters SwimZone tracks in the state.
How is Evans Lake's water quality measured?
SwimZone builds this read from EPA CyAN satellite imagery for blue-green algae, official beach and fecal-bacteria advisories where a program monitors Evans Lake, and a recent-rainfall overlay, all refreshed daily. It was last updated July 22, 2026.

Before you swim: the basics

Swim spots near Evans Lake

All Ohio →

Of the 6 monitored waters nearest Evans Lake, 6 are flagged today.

WaterDistanceTodayAlgae readSampled
Pine LakeLake · Mahoning County3.9 miAdvisory662,435 cells/mLJul 21
Meander Creek ReservoirReservoir · Mahoning County14 miAdvisory325,944 cells/mLJul 21
Guilford LakeLake · Columbiana County18 miAdvisory1,465,895 cells/mLJul 21
Lake MiltonLake · Mahoning County21 miAdvisory354,898 cells/mLJul 21
Berlin LakeLake · Portage County22 miAdvisory527,938 cells/mLJul 21
Deer Creek ReservoirReservoir · Stark County27 miAdvisory1,103,832 cells/mLJul 21