**Exhibit 4.2**

**THIRD SUPPLEMENTAL INDENTURE**

THIS THIRD SUPPLEMENTAL INDENTURE dated as of October 24, 2006among CRC Health Corporation, a Delaware corporation (the “Company”), the Guarantors, Madrid Merger Corporation, a California corporation (the “New Guarantor”) and U.S. Bank National Association, as trustee (the“Trustee”). 

WHEREAS, the Company and the Guarantors have heretofore executed and delivered to the Trustee an indenturedated as of February 6, 2006 (the “Indenture”), providing for the issuance of $200 million aggregate principal amount of the Company’s 10.75% Senior Subordinated Notes due 2016 (the “Notes”), assupplemented by the First Supplemental Indenture, dated as of July 7, 2006 (the “First Supplemental Indenture”) and further supplemented by the Second Supplemental Indenture, dated as of September 28, 2006 (the“Second Supplemental Indenture”); 

WHEREAS, the Company and the Guarantors propose to further amend and supplement theIndenture to join the New Guarantor, an indirect subsidiary of the Company, as a party to the Indenture as a Guarantor thereunder; 

WHEREAS, pursuant to Section 8.01 of the Indenture, the Company and the Trustee may amend, waive or supplement the Indenture, the Notes or the Guarantees without the consent of any Holders to make any change that would provideadditional rights or benefits to the holders of Notes or that does not adversely affect the legal rights under the Indenture of any such holder; 

WHEREAS, the Company, each Guarantor and the New Guarantor have been authorized by their respective board of directors, partners, or general partners, as applicable, to enter into this Third Supplemental Indenture; 

WHEREAS, all other acts and proceedings required by law, by the Indenture and by the respective certificates of incorporation, certificates of formation,partnership agreements, limited partnership agreements, by-laws and other organizational documents of the Company, each Guarantor and the New Guarantor to make this Third Supplemental Indenture a valid and binding agreement for the purposesexpressed herein, in accordance with its terms, have been duly performed; 

WHEREAS, pursuant to Section 8.06 of the Indenture, theTrustee is authorized to execute and deliver this Third Supplemental Indenture; 

WHEREAS, the Company hereby requests that the Trusteeexecute and deliver this Third Supplemental Indenture; 

NOW, THEREFORE, for in consideration of the premises herein contained and in orderto effect the proposed amendment to join the New Guarantor to the Indenture pursuant to Section 8.01 of the Indenture, the Company, the New Guarantor and the Guarantors agree with the Trustee as follows: 

ARTICLE I 

Amendment of Indenture

1.1. Amendment of Indenture. As of the date hereof, this ThirdSupplemental Indenture amends the Indenture by joining the New Guarantor as a party to the Indenture, as a Guarantor thereunder. 

1.2.Execution and Delivery of Note Guarantee. Upon the effectiveness of this Third Supplemental Indenture, the New Guarantor agrees that a notation of its Guarantee substantially in the form attached as Exhibit G to the Indenture, will beendorsed by a duly authorized officer of the New Guarantor on each Note authenticated and delivered by the Trustee under the Indenture. 

ARTICLE II 

Miscellaneous Provisions

2.1. Instruments to be Read Together. This Third Supplemental Indenture is an indenture supplemental to and in implementation of the Indenture, and said Indenture, the First Supplemental Indenture, the SecondSupplemental Indenture and this Third Supplemental Indenture shall henceforth be read together. 

2.2. Confirmation. The Indenture asamended and supplemented by the First Supplemental Indenture, the Second Supplemental Indenture and further amended and supplemented by this Third Supplemental Indenture is in all respects confirmed and preserved. 

2.3. Terms Defined. Capitalized terms used herein without definition shall have the meanings assigned to them in the Indenture. 

2.4. Counterparts. This Third Supplemental Indenture may be signed in any number of counterparts each of which so executed shall be deemed to bean original, but all such counterparts shall together constitute but one and the same instrument. 

2.5. Effect of Headings. Thesection headings herein are for convenience only and shall not affect the construction hereof. 

2.6. Effectiveness. The provisionsof this Third Supplemental Indenture will take effect immediately upon execution thereof by the parties hereto. 

2.7. Trust IndentureAct Controls. If any provision of this Third Supplemental Indenture limits, qualifies or conflicts with another provision that is required by or deemed to be included in this Third Supplemental Indenture by the Trust Indenture Act, the requiredor incorporated provision shall control. 

2.8. Governing Law. **THIS THIRD SUPPLEMENTAL INDENTURE SHALL BE GOVERNED BY ANDCONSTRUED IN ACCORDANCE WITH THE LAWS OF THE**

 

-2- 

**STATE OF NEW YORK, AS APPLIED TO CONTRACTS MADE AND PERFORMED WITHIN THE STATE OF NEW YORK.**

2.9. Trustee. The Trustee makes no representations as to the validity or sufficiency of this Third Supplemental Indenture. The recitals andstatements herein are deemed to be those of the Company, the Guarantors and the New Guarantor and not of the Trustee. 

*[the remainder ofthis page intentionally left blank]*

 

-3- 

IN WITNESS WHEREOF, the undersigned have executed this Third Supplemental Indenture this 24th day ofOctober, 2006. 

 
CRC HEALTH CORPORATIONBy: 
/s/ Kevin Hogge
Name: Kevin HoggeTitle: Chief Financial Officer
[Signature Page to Third Supplemental Indenture] 

**CORPORATE SUBSIDIARIES:**4therapy.com NETWORKADVANCED TREATMENT SYSTEMS, INC.ATS OF CECIL COUNTY, INC.ATS OF DELAWARE, INC.ATS OF NORTH CAROLINA, INC.BATON ROUGE TREATMENT CENTER, INC.BECKLEY TREATMENT CENTER, INC.BGI OF BRANDYWINE, INC.BOWLING GREEN INN OF PENSACOLA, INC.BOWLING GREEN INN OF SOUTH DAKOTA, INC.CAPS OF VIRGINIA, INC.CARTERSVILLE CENTER, INC.CHARLESTON TREATMENT CENTER INC.CLARKSBURG TREATMENT CENTER, INC.COMPREHENSIVE ADDICTION PROGRAMS, INC.CORAL HEALTH SERVICES, INC.CRC ED TREATMENT, INC.CRC HEALTH OREGON, INC.CRC HEALTH TENNESSEE, INC.CRC RECOVERY, INC.EAST INDIANA TREATMENT CENTER, INC.EVANSVILLE TREATMENT CENTER INC.GALAX TREATMENT CENTER, INC.GREENBRIER TREATMENT CENTER, INC.HUNTINGTON TREATMENT CENTER, INC.INDIANAPOLIS TREATMENT CENTER, INC.JAYCO ADMINISTRATION, INC.JEFF-GRAND MANAGEMENT CO., INC.KANSAS CITY TREATMENT CENTER, INC.By: 
/s/ Kevin Hogge
Name: Kevin HoggeTitle: Chief Financial Officer
[Signature Page to Third Supplemental Indenture] 

**CORPORATE SUBSIDIARIES (cont.):**MADRID MERGER CORPORATIONMINERAL COUNTY TREATMENT CENTER, INC.MWB ASSOCIATES-MASSACHUSETTS, INC.NATIONAL SPECIALTY CLINICS, INC.NSC ACQUISITION CORP.PARKERSBURG TREATMENT CENTER, INC.RICHMOND TREATMENT CENTER, INC.SAN DIEGO HEALTH ALLIANCESHELTERED LIVING INCORPORATEDSIERRA TUCSON INC.SOBER LIVING BY THE SEA, INC.SOUTHERN INDIANA TREATMENT CENTER INC.SOUTHERN WEST VIRGINIA TREATMENT CENTER, INC.SOUTHWEST ILLINOIS TREATMENT CENTER, INC.STONEHEDGE CONVALESCENT CENTER, INC.TRANSCULTURAL HEALTH DEVELOPMENT, INC.TREATMENT ASSOCIATES, INC.VIRGINIA TREATMENT CENTER, INC.VOLUNTEER TREATMENT CENTER, INC.WCHS OF COLORADO (G), INC.WCHS, INC.WHEELING TREATMENT CENTER, INC.WHITE DEER REALTY, LTD.WHITE DEER RUN, INC.WICHITA TREATMENT CENTER INC.WILLIAMSON TREATMENT CENTER, INC.WILMINGTON TREATMENT CENTER, INC.By: 
/s/ Kevin Hogge
Name: Kevin HoggeTitle: Chief Financial Officer
[Signature Page to Third Supplemental Indenture] 

SAN DIEGO TREATMENT SERVICESBy: Jayco Administration, Inc.Its: PartnerBy: 
/s/ Kevin Hogge
Name: Kevin HoggeTitle: Chief Financial OfficerBy: Treatment Associates, Inc.Its: PartnerBy: 
/s/ Kevin Hogge
Name: Kevin HoggeTitle: Chief Financial Officer
[Signature Page to Third Supplemental Indenture] 

CALIFORNIA TREATMENT SERVICESBy: Jayco Administration, Inc.Its: PartnerBy: 
/s/ Kevin Hogge
Name: Kevin HoggeTitle: Chief Financial OfficerBy: Treatment Associates, Inc.Its: PartnerBy: 
/s/ Kevin Hogge
Name: Kevin HoggeTitle: Chief Financial Officer
[Signature Page to Third Supplemental Indenture] 

MILWAUKEE HEALTH SERVICES SYSTEMBy: WCHS, Inc.Its: PartnerBy: 
/s/ Kevin Hogge
Name: Kevin HoggeTitle: Chief Financial OfficerBy: Coral Health Services, Inc.Its: PartnerBy: 
/s/ Kevin Hogge
Name: Kevin HoggeTitle: Chief Financial Officer
[Signature Page to Third Supplemental Indenture] 

THE CAMP RECOVERY CENTERS, L.P.By: CRC Recovery, Inc.Its: General PartnerBy: 
/s/ Kevin Hogge
Name: Kevin HoggeTitle: Chief Financial OfficerBy: CRC Health CorporationIts: Limited PartnerBy: 
/s/ Kevin Hogge
Name: Kevin HoggeTitle: Chief Financial Officer
[Signature Page to Third Supplemental Indenture] 

STONEHEDGE CONVALESCENT CENTER

LIMITEDPARTNERSHIP
By: Stonehedge Convalescent Center, Inc.Its: General PartnerBy: 
/s/ Kevin Hogge
Name: Kevin HoggeTitle: Chief Financial OfficerBy: Comprehensive Addiction Programs, Inc.Its: Limited PartnerBy: 
/s/ Kevin Hogge
Name: Kevin HoggeTitle: Chief Financial Officer
[Signature Page to Third Supplemental Indenture] 

U.S. BANK NATIONAL ASSOCIATION,as TrusteeBy: 
/s/ Richard Prokosch
Name: Richard ProkoschTitle: Vice President
[Signature Page to Third Supplemental Indenture]