remains to a high standard vs remains at a high standard

Some examples from the web:

• Mermaid understands education facilities require very different solutions to ensure the presentation remains to a high standard all year round.
• May 30, 2019 ... The glistening Tunis Beige paintwork remains to a high standard and still presents with a sharp metallic flake.
• Feb 26, 2021 ... Many of the tests that are required check that the quality of a product remains to a high standard, any products containing water are at ...
• ... may have moved from Penshurst to Mortdale some years ago and prices may have changed since 1982, But the Quality & Service remains to a high standard.
• Our number one priority is to ensure the quality of our service does not waver and remains to a high standard, therefore we are continually monitoring the ...
• This ensures your local environment remains to a high standard throughout the year. These services include: grass cutting; shrubbery pruning ...
• All we ask in return is that your work remains to a high standard and all projects are completed on time. A diverse team makes our work better. Everyone has ...
• Sep 11, 2020 ... This ensures the quality of the items you receive remains to a high standard. Because our team has the experience and knowledge to ensure ...
• Apr 27, 2022 ... Many of the tests that are required check that the quality of a product remains to a high standard. For example, any products containing ...
• Jun 11, 2021 ... ... small factory close to Heather's location where she can oversee the production process and ensure everything remains to a high standard.

Some examples from the web:

• purchase ensure that water quality for San Diegans remains at a high standard, but the agreement has great benefits for wildlife in the area as well.
• Sep 28, 2022 ... This framework supports us as nurses, midwives and care staff in ensuring our care remains at a high standard, as well as demonstrating our ...
• ... both written and verbal is key and above all, you must have great customer service skills to ensure that our service remains at a high standard.
• Jan 16, 2009 ... They operate to make sure the city's drinking water remains at a high standard, that wetlands and streams are protected from pollutants and ...
• Both offer more inclusions than their competitors and both carry fewer passengers than most river lines, ensuring that service remains at a high standard.
• Feb 23, 2020 ... ... a Memorandum of Understanding (MoU) with the International Post Corporation (IPC) to ensure air mail service remains at a high standard.
• ... to the doctors that work in the hosting hospitals to ensure that, after the team departs, the quality of medical care remains at a high standard.
• The product quality remains at a high standard level due to equipments and materials coming from high-tech countries (Germany, South Korea, ...
• ... flooring and upholstery in your workplace reflects your identity as a company. We'll ensure that this identity remains at a high standard.