I, Diana P. Herrmann, certify that:
1. I have reviewed this report on Form N-CSR of Narragansett Insured
Tax-Free Income Fund;
2. Based on my knowledge, this report does not contain any untrue
statement of a material fact or omit to state a material fact
necessary to make the statements made, in light of the
circumstances under which such statements were made, not
misleading with respect to the period covered by this report;
3. Based on my knowledge, the financial statements, and other
financial information included in this report, fairly present in
all material respects the financial condition, results of operations,
changes in net assets, and cash flows (if the financial statements
are required to include a statement of cash flows) of the registrant
as of, and for, the periods presented in this report;
4. The registrant's other certifying officers and I are responsible
for establishing and maintaining disclosure controls and procedures
(as defined in Rule 30a-2(c) under the Investment Company Act of 1940)
for the registrant and have:
a) designed such disclosure controls and procedures to ensure that material
information relating to the registrant, including its consolidated
subsidiaries, is made known to us by others within those entities,
particularly during the period in which this report is being prepared;
b) evaluated the effectiveness of the registrant's disclosure controls
and procedures as of a date within 90 days prior to the filing date of this
report ("Evaluation Date"); and
c) presented in this report our conclusions about the effectiveness of the
disclosure controls and procedures based on our evaluation as of the
Evaluation Date;
5. The registrant's other certifying officers and I have disclosed, based
on our most recent evaluation, to the registrant's auditors and the audit
committee of the registrant's board of directors (or persons performing the
equivalent functions):
a) all significant deficiencies in the design or operation of internal
controls which could adversely affect the registrant's ability to record,
process, summarize, and report financial data and have identified for the
registrant's auditors any material weakness in internal controls; and
b) any fraud, whether or not material, that involves management or other
employees who have a significant role in the registrant's internal controls;
and
6. The registrant's other certifying officers and I have indicated in this
report whether or not there were significant changes in internal controls or
in other factors that could significantly affect internal controls subsequent
to the date of our most recent evaluation, including any corrective actions
with regard to significant deficiencies and material weaknesses.
Date: September 9, 2005
/s/ Diana P. Herrmann
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Title: Vice Chair and President
I, Joseph P. DiMaggio, certify that:
1. I have reviewed this report on Form N-CSR of Narragansett Insured
Tax-Free Income Fund;
2. Based on my knowledge, this report does not contain any untrue
statement of a material fact or omit to state a material fact
necessary to make the statements made, in light of the
circumstances under which such statements were made, not
misleading with respect to the period covered by this report;
3. Based on my knowledge, the financial statements, and other
financial information included in this report, fairly present in
all material respects the financial condition, results of operations,
changes in net assets, and cash flows (if the financial statements
are required to include a statement of cash flows) of the registrant
as of, and for, the periods presented in this report;
4. The registrant's other certifying officers and I are responsible
for establishing and maintaining disclosure controls and procedures
(as defined in Rule 30a-2(c) under the Investment Company Act of 1940)
for the registrant and have:
a) designed such disclosure controls and procedures to ensure that material
information relating to the registrant, including its consolidated
subsidiaries, is made known to us by others within those entities,
particularly during the period in which this report is being prepared;
b) evaluated the effectiveness of the registrant's disclosure controls
and procedures as of a date within 90 days prior to the filing date of this
report ("Evaluation Date"); and
c) presented in this report our conclusions about the effectiveness of the
disclosure controls and procedures based on our evaluation as of the
Evaluation Date;
5. The registrant's other certifying officers and I have disclosed, based
on our most recent evaluation, to the registrant's auditors and the audit
committee of the registrant's board of directors (or persons performing the
equivalent functions):
a) all significant deficiencies in the design or operation of internal
controls which could adversely affect the registrant's ability to record,
process, summarize, and report financial data and have identified for the
registrant's auditors any material weakness in internal controls; and
b) any fraud, whether or not material, that involves management or other
employees who have a significant role in the registrant's internal controls;
and
6. The registrant's other certifying officers and I have indicated in this
report whether or not there were significant changes in internal controls or
in other factors that could significantly affect internal controls subsequent
to the date of our most recent evaluation, including any corrective actions
with regard to significant deficiencies and material weaknesses.
Date: September 9, 2005
/s/ Joseph P. DiMaggio
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Title: Chief Financial Officer and Treasurer