**Exhibit 31.1**

 

**RULE13a-14(a)/15d-14(a) CERTIFICATION PURSUANT TO**

**SECTION 302OF THE SARBANES-OXLEY ACT OF 2002**

 

I,Brian Pratt, certify that:

 

1.             I have reviewedthis Quarterly Report on Form 10-Q for the period ended June 30, 2010 ofPrimoris Services Corporation;

 

2.             Based on myknowledge, this Quarterly Report does not contain any untrue statement of amaterial fact or omit to state a material fact necessary to make the statementsmade, in light of the circumstances under which such statements were made, notmisleading with respect to the period covered by this Quarterly Report;

 

3.             Based on myknowledge, the financial statements, and other financial information includedin this Quarterly Report, fairly present in all material respects the financialcondition, results of operations and cash flows of the registrant as of, andfor, the periods presented in this Quarterly Report;

 

4.             The registrant’sother certifying officer and I are responsible for establishing and maintainingdisclosure controls and procedures (as defined in Exchange ActRules 13a-15(e) and 15d-15(e)) and internal control over financialreporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f))for the registrant and have:

 

(a)           Designedsuch disclosure controls and procedures, or caused such disclosure controls andprocedures to be designed under our supervision, to ensure that materialinformation relating to the registrant, including its consolidatedsubsidiaries, is made known to us by others within those entities, particularlyduring the period in which this Quarterly Report is being prepared;

 

(b)           Designedsuch internal control over financial reporting, or caused such internal controlover financial reporting to be designed under our supervision, to providereasonable assurance regarding the reliability of financial reporting and thepreparation of financial statements for external purposes in accordance withgenerally accepted accounting principles;

 

(c)           Evaluatedthe effectiveness of the registrant’s disclosure controls and procedures andpresented in this Quarterly Report our conclusions about the effectiveness ofthe disclosure controls and procedures, as of the end of the period covered bythis Quarterly Report based on such evaluation; and

 

(d)           Disclosedin this Quarterly Report any change in the registrant’s internal control overfinancial reporting that occurred during the registrant’s most recent fiscalquarter that has materially affected, or is reasonably likely to materiallyaffect, the registrant’s internal control over financial reporting; and

 

5.             The registrant’sother certifying officer and I have disclosed, based on our most recentevaluation of internal control over financial reporting, to the registrant’sauditors and the audit committee of the registrant’s board of directors (orpersons performing the equivalent functions):

 

(a)           Allsignificant deficiencies and material weaknesses in the design or operation ofinternal control over financial reporting which are reasonably likely toadversely affect the registrant’s ability to record, process, summarize andreport financial information; and

 

(b)           Anyfraud, whether or not material, that involves management or other employees whohave a significant role in the registrant’s internal control over financialreporting.

 

Date:  August 9, 2010

 
| /s/  BRIAN PRATT                                                |   |
|-----------------------------------------------------------------|--------|
| Brian  Pratt                                                    |   |
| *Chairman of the Board, Chief Executive Officer and  President* |   |

 

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