EXHIBIT 99.1 (INSITUFORM-TECH)(INSU) Insituform Technologies, Inc. Reports Second Quarter 2005 Results; Realigns North American CIPP Operations Chesterfield, MO - August 2, 2005 - Insituform Technologies, Inc. (Nasdaq National Market: INSU) today reported second quarter 2005 results. The Company reported net income of $3.6 million, or $0.13 per diluted share, for the second quarter of 2005 compared to $3.2 million, or $0.12 per diluted share, in the same quarter a year ago. Year-to-date, net income was $4.0 million, or $0.15 per diluted share compared to $3.7 million, or $0.14 per diluted share, in the same period last year. These results reflect improvement in the Company's core rehabilitation and Tite Liner(R) businesses, while the tunneling segment delivered operating losses due to continued unfavorable performance on certain projects. Revenues in the second quarter of 2005 increased 11.7% to $159.2 million from $142.4 million in the second quarter of 2004, while revenues for the first six months of 2005 increased 9.3% to $295.4 million as compared to $270.3 million in the first six months of 2004. For the second quarter of 2005 compared to the same quarter in 2004, revenues in the rehabilitation segment increased $18.6 million, or 17.8%, to $123.2 million and gross profit increased $6.0 million, or 24.3%, to $30.8 million. Gross profit margin in the rehabilitation segment was 25.0% in the second quarter of 2005 compared to 23.7% in the second quarter of 2004. Operating income in the rehabilitation segment was $11.7 million in the second quarter of 2005 compared to $5.4 million in the second quarter of 2004. Revenues in the rehabilitation segment increased $28.2 million, or 14.1%, to $228.5 million and gross profit increased $9.5 million, or 21.1%, to $54.6 million in the first six months of 2005 compared to the same period last year. Gross profit margin in the rehabilitation segment was 23.9% in the first six months of 2005 compared to 22.5% in the first six months of 2004. Operating income in the rehabilitation segment was $16.8 million in the first six months of 2005 compared to $7.1 million in the same period last year. The second quarter's rehabilitation results were favorably affected by the recognition of a claim receivable from the Company's excess insurance carrier related to rework for a project in Boston that was performed in the first six months of 2004. In March 2005, the Company received a court ruling in its favor, concluding that the Company's policy with its excess liability insurance carrier provided coverage for costs associated with the rework of the Boston project in excess of the primary comprehensive general liability insurance. The Company's primary insurance carrier had previously paid its portion of the claim related to the Boston project. In addition, in March 2005, the entire liner was inspected in accordance with the Company's arrangement with the client, and it was determined that the one segment that had not been treated in 2004 was in need of replacement in the same fashion as all of the other segments replaced in 2004. Work began late in the second quarter of 2005 to remove and repair this segment. The Company recognized a claim of $6.1 million for the estimated recoverable amounts related to the rework completed in 2004 and the work to be completed in 2005, which was offset by the costs of performing the rework on the remaining segment, estimated at $2.4 million. As a result, the net benefit to the Company's gross profit for the second quarter of 2005 regarding activity surrounding the Boston project was $3.4 million ($2.2 million after-tax). An additional $0.3 million was recognized as pre-judgment interest related to the claim. In the second quarter of 2005, the Company's rehabilitation operations experienced revenue growth resulting from increased backlog in most North American and European operations. Excluding the effect of the insurance claim recognition, gross margin declined by 1.5 percentage points due primarily to job execution issues, along with continuing effects of increased commodity prices, particularly in resin, on some of the longer-term projects where the Company was unable to pass through these increases to its customers in real time. The Company is undertaking an operational realignment of it North American rehabilitation business units. The number of geographical regions has been reduced from six to four in North America. The new structure is intended to improve gross margins through enhanced execution and by consistently aligning the roles and responsibilities of all field leadership positions across all four business units. Revenues in the tunneling segment decreased 14.1% to $26.8 million in the second quarter of 2005 compared to $31.1 million in the second quarter of 2004. In the first six months of 2005, tunneling revenues decreased 11.3% to $50.7 million compared to $57.2 million in the first six months of 2004. The decreases in revenues are due to lower backlog and more selective bidding practices. The Company's tunneling business recorded operating losses of $6.4 million and $9.8 million in the second quarter and first six months of 2005, respectively. The most significant contributor to the tunneling losses continued to be the Chicago project, which took a further write-down of $4.8 million in the second quarter of 2005 and has lost $4.9 million in the first six months of 2005. There were also further adverse margin developments in the second quarter on certain other projects, where in certain instances, the Company believes it will have a claim against the client, which may benefit future periods. The Company is currently in the process of developing a claim against one of its customers which could approximate $2 million pre-tax and which has not been reflected in income at this time. Tite Liner(R)'s revenue increased $2.5 million, or 37.5%, to $9.2 million and gross profit increased $0.6 million, or 23.4%, to $2.9 million in the second quarter of 2005 compared to the same quarter of 2004. Gross profit margins were 31.9% and 35.6% in the second quarters of 2005 and 2004, respectively. In the first six months of 2005, gross profit margin was 30.4% compared to 34.8% for the same period last year. In 2005, there has been more work in Tite Liner(R)'s South American operations, which traditionally carries lower margins, causing the gross profit margin decline. The Company improved its cash balance to $70.6 million at June 30, 2005 from $55.5 million at March 31, 2005, due primarily to improved collections of receivables. Receivables remained relatively flat as compared to the March 31, 2005 balance, despite an increase of $22.9 million in revenue in the second quarter. Other current assets increased by $6.1 million as compared to March 31, 2005 and $8.9 million as compared to December 31, 2004, due primarily to the recognition of the insurance claim for the Boston project in the second quarter. Accounts payable and accrued expenses increased $15.5 million and $16.7 million, respectively, as compared to March 31, 2005 and December 31, 2004 due primarily to the growth in the business and improved working capital management. Overall, cash flows from operations provided $23.5 million in the quarter ended June 30, 2005. Capital expenditures were $8.0 million in the second quarter and $15.6 million for the first six months of 2005, as compared to $8.9 and $16.6 million in the same periods in 2004. Total contract backlog at June 30, 2005 was $327.7 million, a $33.6 million increase from March 31, 2005, and a $0.5 million decrease from December 31, 2004. Rehabilitation backlog increased $21.5 million, or 11.8% due to growth in several North American regions. Tunneling backlog increased by $12.7 million, or 12.7%, from March 31, 2005, due primarily to the signing of a $40 million project in Charleston, South Carolina during the quarter. Compared to contract backlog at June 30, 2004, rehabilitation backlog increased by $24.2 million, Tite Liner(R) backlog increased by $6.6 million and tunneling backlog decreased by $35.5 million. The Company will host a conference call at 10:30 a.m. EDT on Wednesday, August 3, 2005. At such time, the call may be accessed by clicking on the Presentations tab on the Investor Relations page of the Company's Web site (www.insituform.com) or by using the following link: www.shareholder.com/insituform/MediaList.com. An audio archive of the webcast will be available approximately two hours after the call through www.insituform.com. The archive will be available for one week. Insituform Technologies, Inc. is a leading worldwide provider of proprietary technologies and services for rehabilitating sewer, water and other underground piping systems without digging and disruption. More information about the Company can be found on its Internet site at www.insituform.com. This news release contains forward-looking statements (as such term is defined in the Private Securities Litigation Reform Act of 1995) that are based on information currently available to the management of Insituform Technologies, Inc. 2 and on management's beliefs and assumptions. When used in this news release, the words "anticipate," "estimate," "believes," "plans," and similar expressions are intended to identify forward-looking statements, but are not the exclusive means of identifying such statements. These statements are inherently subject to risks and uncertainties that could cause actual results to differ materially from those projected. Factors which could affect results include, among others, the competitive environment for the Company's products and services, the availability of raw materials used in the Insituform(R) cured-in-place ("Insituform CIPP") process, increased competition upon expiration of the Company's patents or the inadequacy of one or more of its CIPP process patents to protect its operations, the geographical distribution and mix of the Company's work, the ability of the Company to attract business at acceptable margins, foreseeable and unforeseeable issues in projects that make it difficult or impossible to meet projected margins, the timely award or cancellation of projects, political circumstances impeding the progress of work, the Company's ability to remain in compliance with its financial covenants, the regulatory environment, the outcome of the Company's pending litigation and other factors set forth in reports and documents filed by the Company with the Securities and Exchange Commission from time to time. The Company does not assume a duty to update forward-looking statements. Please use caution and do not place reliance on forward-looking statements. 3 INSITUFORM TECHNOLOGIES, INC. CONSOLIDATED STATEMENTS OF INCOME (Unaudited) (In thousands, except per share amounts) For the Three Months For the Six Months Ended June 30, Ended June 30, 2005 2004 2005 2004 Revenues $159,153 $142,434 $295,430 $270,348 Cost of revenues 129,618 111,870 239,796 214,417 Gross profit 29,535 30,564 55,634 55,931 Operating expenses 22,739 22,974 46,197 44,966 Operating income 6,796 7,590 9,437 10,965 Other (expense) income: Interest expense (2,127) (2,258) (4,294) (4,795) Interest income 676 255 967 624 Other (209) (173) (164) (337) Total other expense (1,660) (2,176) (3,491) (4,508) Income before taxes on income 5,136 5,414 5,946 6,457 Taxes on income 1,797 2,238 2,081 2,663 Income before minority interests and equity in earnings 3,339 3,176 3,865 3,794 Minority interests (40) (45) (79) (101) Equity in earnings of affiliated companies 289 25 202 (35) Net income 3,588 3,156 3,988 3,658 Earnings per share of common stock and common stock equivalents Basic $0.13 $0.12 $0.15 $0.14 Diluted 0.13 0.12 0.15 0.14 Average Number of Shares Basic 26,754 26,685 26,750 26,587 Average Number of Shares Diluted 26,851 26,782 26,869 26,718 4 For the Three Months For the Six Months Ended June 30, Ended June 30, 2005 2004 2005 2004 SEGMENT DATA Revenues Rehabilitation $123,231 $104,625 $228,458 $200,254 Tunneling 26,761 31,145 50,711 57,195 Tite Liner(R) 9,161 6,664 16,261 12,899 Total revenues $159,153 $142,434 $295,430 $270,348 Gross profit (loss) Rehabilitation $30,769 $24,757 $54,576 $45,062 Tunneling (4,158) 3,437 (3,893) 6,383 Tite Liner(R) 2,924 2,370 4,951 4,486 Total gross profit $29,535 $30,564 $55,634 $55,931 Operating income (loss) Rehabilitation $11,684 $5,364 $16,807 $7,091 Tunneling (6,396) 835 (9,796) 1,331 Tite Liner(R) 1,508 1,391 2,426 2,543 Total operating income $6,796 $7,590 $9,437 $10,965 5 INSITUFORM TECHNOLOGIES, INC. CONSOLIDATED CONDENSED BALANCE SHEETS (Unaudited) (In thousands) June 30, 2005 December 31, 2004 ASSETS CURRENT ASSETS Cash and cash equivalents $70,583 $93,246 Restricted cash 1,394 1,705 Receivables, net 90,303 78,665 Retainage 28,584 25,655 Costs and estimated earnings in excess of billings 34,710 34,789 Inventories 14,463 13,339 Prepaid expenses and other assets 30,323 21,469 TOTAL CURRENT ASSETS 270,360 268,868 PROPERTY, PLANT AND EQUIPMENT, less accumulated depreciation 97,094 90,846 OTHER ASSETS Goodwill 131,529 131,540 Other assets 16,742 17,567 TOTAL OTHER ASSETS 148,271 149,107 TOTAL ASSETS $515,725 $508,821 LIABILITIES AND STOCKHOLDERS' EQUITY CURRENT LIABILITIES Current maturities of long-term debt and line of credit $16,447 $15,778 Accounts payable and accrued expenses 102,085 85,398 Billings in excess of costs and estimated earnings 15,025 12,809 TOTAL CURRENT LIABILITIES 133,557 113,985 LONG-TERM DEBT, less current maturities 80,774 96,505 OTHER LIABILITIES 8,042 6,848 TOTAL LIABILITIES 222,373 217,338 MINORITY INTERESTS 1,676 1,647 TOTAL STOCKHOLDERS' EQUITY 291,676 289,836 TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY $515,725 $508,821 6 INSITUFORM TECHNOLOGIES, INC. CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (In thousands) For the Six Months Ended June 30, 2005 2004 Cash flows from operating activities: Net income $3,988 $3,658 Adjustments to reconcile to net cash provided (used) by operating activities: Depreciation 8,960 8,164 Amortization 812 1,190 Deferred income taxes 512 35 Write-off of debt issuance costs - 226 Other (583) 3,256 Changes in operating assets and liabilities: Change in restricted cash related to operating activities 311 181 Receivables, including costs and estimated earnings in excess of billings (17,643) (7,612) Inventories (1,415) (2,192) Prepaid expenses and other assets (8,099) 11,077 Accounts payable and accrued expenses 23,681 4,608 Net cash provided by operating activities 10,524 22,591 Cash flows from investing activities: Capital expenditures (15,642) (16,598) Proceeds from sale of fixed assets 523 473 Investment in joint venture - (844) Net cash used in investing activities (15,119) (16,969) Cash flows from financing activities: Proceeds from issuance of common stock 325 2,913 Principal payments on long-term debt (15,750) (15,813) Deferred financing charges paid (260) (633) Change in restricted cash related to financing activities - 4,602 Net cash used in financing activities (15,685) (8,931) Effect of exchange rate on cash (2,383) (728) Net decrease in cash and cash equivalents for the period (22,663) (4,037) Cash and cash equivalents, beginning of period 93,246 93,865 Cash and cash equivalents, end of period 70,583 89,828 CONTACT: Insituform Technologies, Inc. Christian G. Farman, Senior Vice President and CFO (636) 530-8000 7