Coverage description
An Insurance Services Office (ISO) standard form. It excludes excess liability coverage for injury or damage that would not have happened but for exposure to PFAS (perfluoroalkyl or polyfluoroalkyl substances), and for costs of testing, cleaning up or responding to them.
Editions
Edition dates as filed, newest first. Filing counts include every state submission that lists the edition.
| Edition | Filings | Companies | States | Filed |
|---|---|---|---|---|
| 05 23May 2023Latest | 74 | 40 | 39 | Oct 2022 to Oct 2026 |
1 other edition date appears in one or two filings each, often carrier-specific versions: 09 22.
What the filings show
- Edition in use: in the past 12 months, 4 companies filed the 05 23 edition.
- CU 34 54 (Exclusion - Perfluoroalkyl and Polyfluoroalkyl Substances (PFAS)) is filed alongside it most often, in 62 of the same filings (83%).
Filed under
Data from admitted P&C filings with state insurance departments, submitted Oct 2021 to Oct 2026, excluding withdrawn and rejected filings. One filing can cover several affiliated companies.
Carriers filing this form
The 10 carrier groups with the most filings that include CX 21 97, out of 22 in total.
| Carrier | Filings | States | Editions, most filed first | Last filed |
|---|---|---|---|---|
| Insurance Services Office, Inc.Advisory Organization | 38 | 38 | 05 23 | Apr 4, 2023 |
| Tokio Marine Holdings Incorporated GroupSafety National Casualty Corporation | 5 | 2 | 05 23 | Feb 17, 2026 |
| ACP Insurance Mgmt LLC GroupAccelerant National Insurance Company | 4 | 3 | 05 23 | May 13, 2024 |
| Amtrust Financial Services Group7 group companies filed it, led by Security National Insurance Company and Technology Insurance Company, Inc. | 3 | 2 | 05 2309 22 | Oct 15, 2026 |
| THE Hanover Insurance Group2 group companies filed it, led by The Hanover Insurance Company and NOVA Casualty Company | 3 | 2 | 05 23 | Feb 20, 2026 |
| BCBS OF MI Group3 group companies filed it, led by Accident Fund Insurance Company of America and Star Insurance Company | 2 | 2 | 05 23 | Jul 22, 2026 |
| Markel Corporation GroupState National Insurance Company, Inc. | 2 | 1 | 05 23 | May 30, 2023 |
| Munich RE Group4 group companies filed it, led by American Alternative Insurance Corporation and American Family Home Insurance Company | 2 | 1 | 05 23 | Jun 27, 2025 |
| OLD Republic GroupOld Republic Insurance Company | 2 | 1 | 05 23 | Jun 30, 2025 |
| Sompo GroupSompo America Insurance Company | 2 | 2 | 05 23 | Sep 8, 2023 |
How the largest insurers handle CX 21 97
Groups among the largest commercial umbrella and excess insurers that filed CX 21 97 or their own version in the past five years.
- Chubb Limited GroupFiles its own version: 07-02-2901 Exclusion – Perfluoroalkyl And Polyfluoroalkyl Substances (PFAS) (38 states)
- Berkshire Hathaway GroupFiles its own version: L 838PFAS Exclusion – Perfluoroalkyl and Polyfluoroalkyl Substances (PFAS) (28 states)
- WR Berkley Corporation GroupFiles its own version: CL CX 2506 Exclusion - Perfluoroalkyl and Polyfluoroalkyl Substances (PFAS) (20 states)
- Fairfax Financial GroupFiles its own version: HXCA-3027 (09-26) Exclusion - Perfluoroalkyl and Polyfluoroalkyl Substances (PFAS) (4 states)
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States
Number of filings that include CX 21 97 in each state, Oct 2021 to Oct 2026. Darker states have more filings.
Often filed with
Standard-style form numbers that appear in the same filings most often.
- CU 34 54Exclusion - Perfluoroalkyl and Polyfluoroalkyl Substances (PFAS)62 filings
- CX 21 93Broad Abuse or Molestation Exclusion22 filings
- CX 21 43Exclusion - Access or Disclosure of Confidential or Personal Information20 filings
- CX 21 94Sexual Abuse or Sexual Molestation Exclusion20 filings
- CX 21 71Exclusion - Unmanned Aircraft19 filings
- CX 24 33Noncontributory - Other Insurance Condition19 filings
- IL 09 99Disclosure of Premium and Estimated Premium for Certified Acts of Terrorism Coverage (Pursuant to Terrorism Risk Insurance Act)19 filings
- CX 00 01Commercial Excess Liability Coverage Form18 filings
- CX 21 02Total Pollution Exclusion18 filings
- CX 21 04Total Pollution Exclusion with a Building Heating, Cooling and Dehumidifying Equipment Exception and a Hostile Fire Exception18 filings
Recent filings
Latest filings that include this form number. Filed copies open in FilingFocus.
| Submitted | Company | State | Editions | Tracking number |
|---|---|---|---|---|
| Oct 20, 2026 | American National Property And Casualty Company | CA | 05 23 | ANPC-134734509 |
| Oct 15, 2026 | Security National Insurance Companyand 2 more | CA | 09 22 | UNKP-135059588 |
| Jul 22, 2026 | Star Insurance Company | SC | 05 23 | ACCD-G134876003 |
| Feb 20, 2026 | NOVA Casualty Company | CA | 05 23 | HNVR-G134848050 |
| Feb 17, 2026 | Safety National Casualty Corporation | CO | 05 23 | SFCC-134815068 |
| Jun 30, 2025 | Old Republic Insurance Company | CO | 05 23 | LDDX-134589971 |
| Jun 27, 2025 | Next Insurance US Company | CA | 05 23 | NXUS-134584662 |
| Jun 24, 2025 | Explorer Insurance Companyand 2 more | CA | 05 23 | ICWG-134580186 |
| May 14, 2025 | Safety National Casualty Corporation | CO | 05 23 | SFCC-134510598 |
| Dec 3, 2024 | Garrison Property and Casualty Insurance Company | CA | 05 23 | PERR-134284759 |
| Aug 14, 2024 | Benchmark Insurance Company | CA | 05 23 | MRTN-134175127 |
| Jun 24, 2024 | Old Republic Insurance Company | CO | 05 23 | LDDX-134154494 |
Most filed ISO CX forms
- CX DS 01 Commercial Excess Liability Declarations
- CX 21 43 Exclusion - Access Or Disclosure Of Confidential Or Personal Material Or Information
- CX 00 01 Commercial Excess Liability Coverage Form
- CX 21 04 Total Pollution Exclusion With A Building Heating, Cooling and Dehumidifying Equipment Exception and a Hostile Fire Exception
- CX 21 93 Broad Abuse Or Molestation Exclusion
- CX 21 94 Sexual Abuse Or Sexual Molestation Exclusion
- CX 21 10 Limitation Of Coverage To Designated Premises, Project Or Operation
- CX 21 79 Cannabis Exclusion
- CX 21 80 Cannabis Exclusion With Hemp Exception
- CX 21 81 Cannabis Exclusion With Hemp And Lessors Risk Exceptions
- CX 21 11 Exclusion – Abuse Or Molestation
- CX 21 18 Exclusion – Abuse Or Molestation – Specified Professional Services
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