Our annual aquatic weed control program will begin on Tuesday June 2 between 8am and 5pm of the Round Lake Aquatic Weed Control Project. This program helps maintain a healthy, usable lake by controlling invasive weeds and algae.
We have a confirmed treatment date! PLM Lake & Land Management will be treating the lake on Tuesday, June 2 between 8am and 5pm. The treatment is expected to take approximately 2 hours.
Great news — we have a confirmed treatment date! PLM Lake & Land Management will be treating the lake on Tuesday, June 2. The treatment is expected to take approximately 2 hours.
What to Expect:
PLM will be applying a combination of ProCellaCOR and Diquat to address the Eurasian watermilfoil (EWM) that is present in the lake. This product combination is designed to deliver fast-acting, season-long control of EWM, with the potential for longer-term results into 2027 and beyond. As the EWM root structure weakens over time, we should see reduced growth in future seasons.
In addition, the treatment will help knock back Illinois pondweed in the shallower areas, which may reduce — or even eliminate — the need for harvesting later this summer. PLM will continue to monitor the lake closely in the weeks ahead. (Here is a link to the Map)
You can expect to start seeing results within 10 days. The lake should be in great shape for the 4th of July!
Posting signs will be placed at the lake ahead of the treatment date as required.
(Here is a link to the sign)
As an option for the 2026 season, PLM Lake & Land Management is offering an Individual Treatment Program to supplement the Round Lake Special Assessment District (SAD). The Current SAD funds the treatment of exotic invasive species (Eurasian watermilfoil) and does not have funds available to control native plant species that inhabit many of the shoreline areas. The additional cost to take part in the Individual Treatment Program is $3.00/ foot of shoreline. This fee includes two treatments targeting multiple native species in a maximum of 100 feet of shoreline per residence, out to approximately 100 feet from shore. The treatments will be planned for late-June & late-July. : https://rlpo.org/wp-content/uploads/2026/05/Round-Lakes-Individual-Treatment-Program-2026.pdf
🌱 What is being treated?
The program targets:
- Invasive aquatic weeds (such as milfoil and curly-leaf pondweed)
- Excessive native plant overgrowth
- Algae blooms
Treatments are applied selectively to improve lake health while preserving the ecosystem.
🧪 What products are being used?
Licensed professionals will apply state-approved aquatic herbicides and algaecides, including:
- Systemic herbicides (longer-lasting, root-killing): ProcellaCOR, Flumigard, Renovate
- Contact herbicides (fast-acting): Diquat, AquaStrike
- Algae control products: Copper sulfate and chelated copper
All products are:
- Approved by the EPA and Michigan EGLE
- Applied by certified applicators
- Used in accordance with strict environmental guidelines
⚠️ Are there any restrictions?
Depending on the treatment, there may be temporary water-use restrictions, such as:
- Limited irrigation use for a short period
- Occasional brief swimming advisories
- Other guidance specific to the product used
👉 Important: Any restrictions will be clearly posted at the lake and included in treatment notifications.
📢 How will residents be notified?
You will be informed through:
- Posted signs at lake access points on treatment days
- Email or community communications (when available)
Each notice will include:
- Treatment date
- Areas treated
- Products used
- Any temporary restrictions
🌎 Is this safe?
Yes—when applied as directed:
- Treatments are widely used across Michigan lakes
- Designed to target plants, not people or fish
- Help improve:
- Water quality
- Recreation (boating, swimming)
- Long-term lake health
📅 When will treatment occur?
Treatments typically occur during the spring (April) and summer months, depending on:
- Weather conditions
- Plant growth cycles
- Lake conditions
Specific dates will be communicated in advance when possible.
FAQ:
Q: Will this treatment be harmful to people or wildlife?
A: Any chemical that is improperly utilized can be harmful. All the chemicals being used by PLM are approved by the EPA and EGLE and will be applied by individuals licensed by the state of Michigan to apply herbicides.
Q: Do we need to stay out of the lake during treatment?
A: The products included in the contract do not have federal swimming restrictions. However, the State of Michigan requires PLM to post a one-day swimming restriction after application to enhance treatment effectiveness by minimizing sediment disturbance. There are no boating or swimming restrictions beyond this, but watering restrictions do apply. Typically, watering turf and ornamentals should be avoided for three to five days after treatment.
Q: What weeds will be treated?
A: PLM will be targeting Eurasian Watermilfoil and Curly Leafpond. These are both considered invasive weeds.
Q: What weeds will not be treated?
A: Lily Pads are not in the scope of the PLM proposal. The lily pad program will be separate from the SAD, as SAD funds are not typically used for individual requests, particularly for lily pads. The program will cost $250 and includes two applications: one in June and a follow-up in late July or early August. Residents will receive an individual form in the spring along with the program notice. I anticipate this program will primarily benefit residents at the west end of the lake, rather than the entire community.
Q: Will this help reduce the goose traffic?
A: PLM makes no claims in this regard. Anecdotally we have heard from other lakes that they have seen a reduction in goose traffic due to a reduction in grasses that geese fed upon.
Q: Are these chemicals harmful to our wells?
A: Chemical treatment of lakes is a widespread practice in Michigan and throughout the United States. To our knowledge there are no reports of well contamination as a result of chemically treating for invasive weeds.
Round Lake Weed Control summary
PLM
◦ PLM has been treating East and West crooked Lakes for the past 15 years.
◦ The lakes water quality appeared to be good. The water was clear and no cloudiness was noted.
◦ Milfoil, curly leaf and native pond weeds were noted. They include eel grass, clasping and white stem, pond weed, along with char. The native weeds were noted in selective areas around the lake.
◦ The company also provides harvesting services. After the first treatment in May, the option to harvest around the lake for any tall native weeds could be provided. To harvest a lake our size it would take about 12 hours at a cost of $4000.
◦ Several herbicides were discussed, such as ProcellaCor, Sonar and Diquat. Fluridone was discussed, however it would not be used until after a four-year water survey was acquired. The use of fluridone has strict restrictions in place and requires a special permit for use. Several other chemicals were also noted in the quote, but were not specifically discussed during the tour. They are Flumioxazin, Aqua Strike and Renovate. Should algae appear chemicals could include Chelated Copper and Seclear G.
◦ The quote states multiple treatments may be needed during the growing season to control multiple species that grow at different times during the season.
◦ In the spring and summer and on clear days, the lake is receiving about 80% sunlight. The company stated given we have a very small shallow lake the weeds populate quickly.
◦ The company contract is for five years.
https://www.michigan.gov/invasives/id-report/plants/aquatic/eurasian-watermilfoil
https://www.michigan.gov/invasives/id-report/plants/aquatic/curly-leaf-pondweed
