On the 1 April 2015, Scottish Water began to deliver the investment requirements for the 2015-21 period as directed by Minister on the 1 October 2014  . The Outputs Monitoring Group is carefully monitoring the delivery of the improvements in line with Scottish Waters delivery plan  and quarterly reports are published on the Scottish Governments website.
In the current regulatory period 2015-21, Scottish Water will invest £3.6 billion in Scotland's water and wastewater services. Scottish Water reported for the financial year 2016-17 that £627 million capital investment has been made and in doing so had delivered a significant contribution towards a number of the Government's key strategic objectives. This investment enabled it to: deliver better services to customers; improve drinking water quality; provide additional capacity to meet the demands of new housing; reduce leakage; and protect Scotland's environment.
Examples of improvements are:
- levels of customer service is now amongst the best in the UK; in 2009-10 Scottish Water ranked amongst the worst;
- environmental compliance has improved significantly over the last five years with significant reductions in numbers of pollution incidents. In 2016-17 there were 238 pollution incidents an improvement on last year and compared to 939 in 2009-10;
- drinking water quality has been sustained at a high level. In 2016-17 99.91% of samples taken met strict quality standards;
- Scottish water supports Scotland‘s economy by investing over £50 million a month with around 215 businesses employing over 2,220 people including 70 graduates and 96 modern apprentices; and
- Scottish Water is facilitating enough renewable generation to meet 100% of its electricity requirements. This will double by 2018.
Scottish Water's investment programme is defined and funded for the period 2015-21. The investment programme is set out in the form of Ministerial Directions and a supporting Technical Expression in the form of a list of outputs.
Scottish Water's Delivery Plan sets out how Scottish Water intends to deliver the investment over the five year period. The current period ends on 31 March 2021.
The Strategic Review of Charges undertaken by the Water Industry Commission for Scotland was completed on 20 November 2014 when it published its Final Determination of Charges  . This determined the amount that customers need to pay in order deliver the necessary improvements to services. It confirmed the agreement that the Customer Forum  had negotiated with Scottish Water on behalf of customers on prices and levels of service represents the lowest overall reasonable cost for customers. The agreement concluded that household charges should not rise by more than the Consumer Prices Index less 1.8% over the six-year period.
The 2015-21 investment plan contains many thousands of projects. Key projects to be delivered in the 2015-21 include:
- major upgrades to Glasgow's sewerage networks including the £100 million, 3.1 mile long Shieldhall tunnel and upgrades to Wastewater Treatment Works at Daldowie and Dalmarnock as part of £250 million 5 year programme; and
- improvements to the water supply in Dundee and Oban and the waste water network in Stromness, and in Ayrshire we have built new 30 mile water main providing resilience and enabling growth.