Health Savings Accounts are regulated by the IRS and have limits of how much money you can contribute in one year. It is your responsibility to ensure that your totals do not exceed the IRS limits.
Single (one person) is $3,650 and family (more than one person) is $7,300. If you are over 55 you can increase the limit by $1000. It is important to include the HSA contribution received from NMC in your calculations. For example- the family amount is reduced by $2,600 (NMC deposit), making the total you can contribute from your paycheck $4,700.