Exhibit 99.1

ADVANCED DRAINAGE SYSTEMS ANNOUNCES SECOND FISCAL QUARTER 2015 RESULTS

HILLIARD, Ohio – (November 5, 2014) – Advanced Drainage Systems, Inc. (NYSE: WMS) (“ADS” or the “Company”), a leading global manufacturer of water management products and solutions for commercial, residential, infrastructure and agricultural applications, today announced financial results for the second fiscal quarter ended September 30, 2014.

Second Fiscal Quarter 2015 Highlights

Joe Chlapaty, Chairman and Chief Executive Officer of ADS commented, “We experienced solid operating performance during the second quarter, reflecting continued momentum in our growth initiatives and strong execution across our business. Our top-line growth was driven by continued strength in our domestic construction markets and improved results from our International operations, which offset weakness in our agriculture markets. In particular, we outpaced market growth in both the non-residential and infrastructure markets primarily through material conversion and market share gains. We also generated double-digit growth in sales of our Allied Products driven by increased demand for our Nyloplast^® and Storm Tech^® product lines. Importantly, we were able to capture operating leverage from the higher sales volumes leading to an improvement in Adjusted EBITDA margin over the prior year period.”

Chlapaty added, “We believe the strength we are seeing in our core domestic construction markets is sustainable, and we expect to continue to benefit from the recovery as it gains momentum. Furthermore, our leadership position and ability to provide a complete water management solution – including both pipe and Allied Products – enables us to drive above-market growth through conversion opportunities from traditional materials. This is evidenced by our sales growth of approximately 15% in our domestic construction markets during the first six months of our current fiscal year.”

ADVANCED DRAINAGE SYSTEMS, INC.     4640 TRUEMAN BOULEVARD,     HILLIARD, OH 43026 TEL: 614 / 658-0050     800 / 733-7473 HTTP://WWW.ADS-PIPE.COM

Second Fiscal Quarter 2015 Results

Net sales were $364.7 million in the second fiscal quarter of 2015, a 9.4% increase compared to second fiscal quarter 2014 net sales of $333.2 million. The growth in the quarter was driven by our domestic construction end markets and improved sales in our International markets. Sales by domestic end markets were as follows: 52.2% in the non-residential market, 17.8% in the residential market, 10.9% in the infrastructure market, and 19.1% in the agriculture market. Growth in the domestic construction markets was primarily driven by a 17.0% increase in sales in the non-residential market and 19.4% increase in sales in the infrastructure market. Allied Products sales increased 12.4% compared to the prior year sales of continuing products, which exclude $2.2 million of Allied Product lines sold in fiscal 2014.

Gross profit increased $9.2 million, or 12.6%, to $82.4 million for the second fiscal quarter of 2015, compared to $73.2 million for the same period last year. As a percentage of net sales, gross profit was 22.6% compared to 22.0% for the prior year period. The improvement in gross margins was largely attributed to increased volume of our pipe products and Allied Products as well as strong cost performance in our manufacturing and logistics operations.

Selling, general and administrative (“SG&A”) expenses for the second fiscal quarter of 2015 increased $2.5 million, or 7.1%, to $38.6 million from $36.1 million for the second fiscal quarter of 2014. The increase in SG&A expenses was driven primarily by higher variable selling expenses tied to sales volume and higher non-cash stock based compensation expenses. As a percentage of net sales, SG&A expenses decreased to 10.6% for the second fiscal quarter of 2015 as compared to 10.8% in the prior year. The decrease in SG&A expenses as a percentage of net sales was driven primarily by the Company’s ability to leverage the incremental expense with higher sales volumes.

The Company reported adjusted EBITDA of $60.5 million for the second fiscal quarter of 2015 compared to adjusted EBITDA of $51.6 million, an increase of 17.2%. As a percentage of net sales, adjusted EBITDA improved to 16.6% for the second fiscal quarter from 15.5% in the year ago period.

Net income attributable to ADS for the second fiscal quarter of 2015 was $22.4 million, 29.3% higher compared to net income attributable to ADS of $17.3 million for the second fiscal quarter of 2014. Net income per diluted share for the second fiscal quarter of 2015 was $0.51 per share based on weighted average common shares outstanding of 56.5 million.

Adjusted Earnings per fully converted share (Non-GAAP) for the second fiscal quarter of 2015 was $0.35 per share based on weighted average fully converted shares of 71.8 million, up from $0.29 per share for the prior year. On a year-to-date basis for the first six months, adjusted earnings per fully converted share totaled $0.60 per share compared to $0.57 per share for the prior year. A reconciliation of earnings per (GAAP) to adjusted earnings per fully converted share (Non-GAAP) is presented below.

ADVANCED DRAINAGE SYSTEMS, INC.     4640 TRUEMAN BOULEVARD,     HILLIARD, OH 43026 TEL: 614 / 658-0050     800 / 733-7473 HTTP://WWW.ADS-PIPE.COM

A reconciliation of GAAP to Non-GAAP financial measures for adjusted EBITDA and adjusted earnings per fully converted share has been provided in the financial statement tables included in this press release. An explanation of these measures is also included below under the heading “Non-GAAP Financial Measures.”

For the first six months of fiscal 2015, the Company recorded net cash provided by operating activities of $10.8 million compared to $3.3 million for the same period last year. In the second quarter of fiscal year 2015, long term debt was reduced by $95.3 million paid for by net proceeds from the IPO of $72.3 million completed in late July and cash flow generated from stronger earnings.

Fiscal Year 2015 Outlook

Based on current visibility, backlog of existing orders and business trends, the Company updated its financial targets for fiscal year 2015. The range for net sales for fiscal year 2015 was tightened to $1.21 to $1.25 billion, while the outlook remained unchanged for adjusted EBITDA and is expected to be in the range of $165 to $175 million. Capital expenditures are expected to be approximately $35 million.

ADVANCED DRAINAGE SYSTEMS, INC.     4640 TRUEMAN BOULEVARD,     HILLIARD, OH 43026 TEL: 614 / 658-0050     800 / 733-7473 HTTP://WWW.ADS-PIPE.COM

Mark Sturgeon, Executive Vice President and Chief Financial Officer of ADS noted, “We generated strong cash flows during the second quarter, which enabled us to bring our net debt-to-EBITDA ratio to 2.58, within our target range of 2 to 3 times. As we look ahead, our priorities for capital deployment remain focused on investments and capital expenditures in our business to drive organic growth, targeted acquisition opportunities that extend our product leadership and complement our existing package, and enhancements to shareholder returns including restarting our dividend program.”

Diluted Shares of Common Stock Outstanding (Non-GAAP)

As of September 30, 2014, the Company had 73.3 million diluted shares of common stock outstanding, inclusive of outstanding shares of unvested restricted common stock and on an as-converted basis with respect to the outstanding shares of ESOP preferred stock. The following table illustrates the breakdown of diluted shares of common stock outstanding:

An explanation of Diluted Shares of Common Stock Outstanding is also included below under the heading “Non-GAAP Financial Measures.”

Webcast Information

The Company will host an investor conference call and webcast on Wednesday, November 5, 2014 at 10:00 a.m. Eastern Time. The live call can be accessed by dialing 1-877-317-6789 (US toll-free) or 1-412-317-6789 (international) and asking to be connected to the Advanced Drainage Systems, Inc. call. The live webcast will also be accessible via the “Events Calendar” section of the Company’s Investor Relations website, www.investors.ads-pipe.com. An archived version of the webcast will be available for 90 days following the call.

About ADS

Advanced Drainage Systems (ADS) is the leading manufacturer of high performance thermoplastic corrugated pipe, providing a comprehensive suite of water management products and superior drainage solutions for use in the construction and infrastructure marketplace. Its innovative products are used across a broad range of end markets and applications, including non-residential, residential, agriculture and infrastructure applications. The Company has established a leading position in many of these end markets by leveraging its national sales and distribution platform, its overall product breadth and scale and its manufacturing excellence. Founded in 1966, the Company operates a global network of 58 manufacturing plants and 29 distribution centers. To learn more about the ADS, please visit the Company’s website at www.ads-pipe.com.

ADVANCED DRAINAGE SYSTEMS, INC.     4640 TRUEMAN BOULEVARD,     HILLIARD, OH 43026 TEL: 614 / 658-0050     800 / 733-7473 HTTP://WWW.ADS-PIPE.COM

Non-GAAP Financial Measures

This press release contains financial information determined by methods other than in accordance with accounting principles generally accepted in the United States of America (“US GAAP”). ADS management uses non-US GAAP measures in its analysis of the Company’s performance. Investors are encouraged to review the reconciliation of non-US GAAP financial measures to the comparable US GAAP results available in the accompanying tables.

Forward Looking Statements

Certain statements in this press release may be deemed to be forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended, including statements regarding the initial public offering. These statements are not historical facts but rather are based on the Company’s current expectations, estimates and projections regarding the Company’s business, operations and other factors relating thereto. Words such as “may,” “will,” “could,” “would,” “should,” “anticipate,” “predict,” “potential,” “continue,” “expects,” “intends,” “plans,” “projects,” “believes,” “estimates” and similar expressions are used to identify these forward-looking statements. Factors that could cause actual results to differ from those reflected in forward-looking statements relating to our operations and business include: fluctuations in the price and availability of resins and other raw materials and our ability to pass any increased costs of raw materials on to our customers in a timely manner; volatility in general business and economic conditions in the markets in which we operate, including, without limitation, factors relating to availability of credit, interest rates, fluctuations in capital and business and consumer confidence; cyclicality and seasonality of the non-residential and residential construction markets and infrastructure spending; the risks of increasing competition in our existing and future markets, including competition from both manufacturers of high performance thermoplastic corrugated pipe and manufacturers of products using alternative materials; our ability to continue to convert current demand for concrete, steel and PVC pipe products into demand for our high performance thermoplastic corrugated pipe and Allied Products; the effect of weather or seasonality; the loss of any of our significant customers; the risks of doing business internationally; the risks of conducting a portion of our operations through joint ventures; our ability to expand into new geographic or product markets; our ability to achieve the acquisition component of our growth strategy; the risk associated with manufacturing processes; our ability to manage our assets; the risks associated with our product warranties; our ability to manage our supply purchasing and customer credit policies; the risks associated with our self-insured programs; our ability to control labor costs and to attract, train and retain highly-qualified employees and key personnel; our ability to protect our intellectual property rights; changes in laws and regulations, including environmental laws and regulations; our ability to project product mix; the risks associated with our current levels of indebtedness; our ability to meet future capital requirements and fund our liquidity needs; and the other risks and uncertainties described in the Company’s filings with the Securities and Exchange Commission. New risks and uncertainties emerge from time to time and it is not possible for the Company to predict all risks and uncertainties that could have an impact on the forward-looking statements contained in this press release. In light of the significant uncertainties inherent in the forward-looking

ADVANCED DRAINAGE SYSTEMS, INC.     4640 TRUEMAN BOULEVARD,     HILLIARD, OH 43026 TEL: 614 / 658-0050     800 / 733-7473 HTTP://WWW.ADS-PIPE.COM

information included herein, the inclusion of such information should not be regarded as a representation by the Company or any other person that the Company’s expectations, objectives or plans will be achieved in the timeframe anticipated or at all. Investors are cautioned not to place undue reliance on the Company’s forward-looking statements and the Company undertakes no obligation to publicly update or revise any forward-looking statements, whether as a result of new information, future events or otherwise, except as required by law.

ADVANCED DRAINAGE SYSTEMS, INC.     4640 TRUEMAN BOULEVARD,     HILLIARD, OH 43026 TEL: 614 / 658-0050     800 / 733-7473 HTTP://WWW.ADS-PIPE.COM

Financial Statements

ADVANCED DRAINAGE SYSTEMS, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF INCOME

(unaudited)

ADVANCED DRAINAGE SYSTEMS, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED BALANCE SHEETS

(unaudited)

ADVANCED DRAINAGE SYSTEMS, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(unaudited)

ADVANCED DRAINAGE SYSTEMS, INC. AND SUBSIDIARIES

SEGMENT REPORTING

(unaudited)

The following table sets forth reportable segment information with respect to the amount of net sales contributed by each class of similar products of our consolidated gross profit in the three and six months ended September 30, 2013 and 2014, respectively:

The following sets forth certain additional financial information attributable to our reportable segments for the three and six months ended September 30, 2013, and 2014, respectively:

Reconciliation of Non-GAAP Measures

We present EBITDA and Adjusted EBITDA because they are key metrics used by management and our board of directors to assess our financial performance, to make budgeting decisions and to compare our performance against that of other peer companies using similar measures.

EBITDA is calculated as net income attributable to ADS before interest, income taxes, depreciation and amortization. Adjusted EBITDA is calculated as EBITDA before stock-based compensation expense, non-cash charges and certain other expenses.

EBITDA and Adjusted EBITDA are not GAAP measures of our financial performance or liquidity. They should not be considered as alternatives to net income as a measure of financial performance or cash flows from operations as a measure of liquidity, or any other performance measure derived in accordance with GAAP. In addition, they should not be construed as an inference that our future results will be unaffected by unusual or non-recurring items. EBITDA and Adjusted EBITDA are not intended to be measures of free cash flow for management’s discretionary use, as they do not reflect certain cash requirements such as tax payments, debt service requirements, capital expenditures and certain other cash costs that may recur in the future. EBITDA and Adjusted EBITDA contain certain other limitations, including the failure to reflect our cash expenditures, cash requirements for working capital needs and cash costs to replace assets being depreciated and amortized. In evaluating Adjusted EBITDA, you should be aware that in the future we will incur expenses that are the same as or similar to some of the adjustments in this presentation, such as stock based compensation expense, derivative fair value adjustments, and foreign currency transaction losses.

The following table presents a reconciliation of EBITDA and Adjusted EBITDA to Net Income attributable to ADS, the most comparable GAAP measure, for each of the periods indicated:

The following table presents a reconciliation of Segment Adjusted EBITDA to Net Income attributable to ADS, the most comparable GAAP measure, for each of the periods indicated:

Reconciliation of Segment EBITDA and Adjusted Segment EBITDA to Net Income

Reconciliation of Segment EBITDA and Adjusted Segment EBITDA to Net Income

Adjusted Earnings per Fully Converted Share, which is a non-GAAP measure, is a supplemental measure of financial performance that is not required by, or presented in accordance with GAAP. We calculate Adjusted earnings per fully converted share (Non-GAAP), and Weighted average fully converted common shares outstanding (Non-GAAP), by adjusting our Net income per share—Basic and Weighted average common shares outstanding – Basic, the most comparable GAAP measures.

To effect this adjustment, we have (1) removed the adjustment for the change in fair value of Redeemable Convertible Preferred Stock classified as mezzanine equity from the numerator of the Net income per share—Basic computation, (2) added back the dividends to Redeemable Convertible Preferred Stockholders and dividends paid to unvested restricted stockholders, (3) made corresponding adjustments to the amount allocated to participating securities under the two-class earnings per share computation method, and (4) added back ESOP deferred compensation attributable to the shares of redeemable convertible preferred stock allocated to employee ESOP accounts during the applicable period, which is a non-cash charge to our earnings and not deductible for income tax purposes.

We have also made adjustments to the Weighted average common shares outstanding – Basic to assume, (1) share conversion of the Redeemable Convertible Preferred Stock to outstanding shares of common stock and (2) add shares of outstanding unvested restricted stock.

Adjusted Earnings Per Fully Converted Share (Non-GAAP) is included in this report because it is a key metric used by management and our board of directors to assess our financial performance. Adjusted Earnings Per Fully Converted Share (Non-GAAP) is not necessarily comparable to other similarly titled captions of other companies due to different methods of calculation.

The following table presents a reconciliation of Adjusted Earnings Per Fully Converted Share (Non-GAAP), and the corresponding Weighted Average Fully Converted Common Shares Outstanding (Non-GAAP) to our Net income per share and corresponding Weighted average common shares outstanding amounts, the most comparable GAAP measure, for each of the periods indicated.

Diluted Shares of Common Stock Outstanding (Non-GAAP) is included in this report because it is a key metric used by management and our board of directors to assess our total market capitalization. We calculate diluted shares of common stock outstanding by adjusting our shares of common stock outstanding for outstanding shares of unvested restricted common stock and on an as-converted basis the outstanding shares of ESOP preferred stock. Diluted shares of common stock outstanding is not necessarily comparable to other similarly titled captions of other companies due to different methods of calculation.

The following table presents a reconciliation of Diluted Shares of Common Stock Outstanding (Non-GAAP) to our shares of Common Stock Outstanding amounts, the most comparable GAAP measure, for the period presented.

For more information, please contact:

Michael Higgins

(614) 658-0050

Mike.Higgins@ads-pipe.com