LHWPG Important Messages
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LHWPG important messages will be posted here to keep you and your famiy & friends informed.
2025 Current Messages:
June 30, 2025 Water Tests
The June 30, 2025 laboroatory results for Fecal Coliforms, a subset of Total Coliform, are below the recreational water standard for E-Coli Standard of 235 mpn/100ml. E-coli, a subset of Fecal Coliforms, is often used as a primary indicator of fecal contamination in recreational water. Therefore, the e-coli from the June sampling (highest level was 62 mpn/100ml by the lagoon, and the lowest was 8 mpn/100ml by Lake Harmony Inn) must be below the regulated standard which is an improvement relative to May sampling event (lagoon level in May was 980 mpn.100ml). Consistently low E-coli demonstrates effective watershed management and pollution control practices.
In accordance with EPA guidance, the acceptable levels for fecal coliform in recreational water is typically less than 200 mpn/100ml. Therefore, a concentration of less than 200 mpn/100ml is considered safe for recreational water activities , such as swimming and boating. Regular monitoring is essential to ensure that fecal colifrm levels remain within safe limits, protecting both public health and aquatic ecosytems.
June 24, 2025
NatureWorks (Tigris) will perform lake treatment for vegetative weed growth on Tuesday June 24. Please, no boating from 4:00 pm until the next morning, it's important not to stir up the treatment. LHA, LHE and Split Rock have been notified. Contact your HOA with questions. Postings will also be up around the lake. Please review Archive Message #1 below for specific instructions.
May 24, 2025
The most recent blue green algae treatment was made in the lagoon following a Split Rock sewage pump failure around May 24, 2025, releasing sewage into the Split Rock Lagoon. Additional treatments will be made as scheduled.
2024 Messages:
June 24
Lake Harmony will be vegetatively treated on Monday June 24 due to excessive weed growth identified throughout the lake. Please, no boating after 4:00 pm. Swimming may continue until the beach closes. Please review Archive Message #1 below for specific instructions.
Archive Message #1. Lake Treatments
Water Shield Treatments:
1. Water Shield Invasive Non-indigenous treatment was performed on October 2, 2023 in the Cove. A boom was in place to capture the vegetation as it died at the root. The treatment was repeated in 2024, but vegetation release was less than expected. This approach is being reconsidered in 2025.
2. No restrictions are required in this area during this project.
Vegetative Treatments:
1. During vegetative treatment, motorized boats need to stay off the lake until the next morning. Canoes & kayacks and swimming are OK.
2. Lake submersed weed treatment treatment cannot be scheduled weeks or months in advance due to change in conditions within the lake as well as the weather.
3. LHWPG will post the day and time for a Natureworks treatment generally the week prior to treatment.
4. Natureworks will post signs around the lake.
5. Lake Harmony Association (LHA), Lake Harmony Estates and Split Rock will also publicize the date and time planned for the treatment.
6. Treatment is scheduled for later in the day (approximately 4:00-8:00 pm) and mid-week, to minimize disruption to boating and lake use activities.
7. Motorized boating must be suspended throughout the evening of the treatment and until the following morning for these reasons:
a. We need to protect the safety of the Natureworks employees applying the treatment as well as the equipment; and
b. We need to be sure the treatment stays where it is applied. Disturbing the application on the targeted sediment and vegetative growth can deactivate the material and destroy the effectiveness.
It's disappointing that the lake is not accessible for this brief period of time, from the evening during the treatment to the following morning, but all lake activities can resume the following day. Thank you for understanding and for following this special message.
When Natureworks employees treat Lake Harmony, they post their Herbicide Treatment Signs around the lake (shown below). Natureworks also provides a Fact Sheet about the treatment. Thank you for reviewing our Events page too.
Blue Algae Bloom Treatments:
Blue algae bloom treatments are made on a case-by case basis by NatureWorks (now Tigris), using a fast-acting chelated copper algicide that is effective within 3-5 days. The lake water remains safe following treatment.
Message #2. LHWPG Website Contacts
Don’t hesitate to reach out with your questions and comments. Contact Us. We can improve with your feedback. Meanwhile, many more good things for Lake Harmony are on the horizon.