TTHM (Total Trihalomethanes) violations in Florida
471 active public water systems in Florida had a TTHM (Total Trihalomethanes) violation in the past three years, 6 of them in the latest quarter of EPA's data. What TTHM (Total Trihalomethanes) is and why it matters.
Health effects: Long-term exposure is associated with increased bladder cancer risk. Some studies link high TTHM exposure to adverse reproductive outcomes. Bromodichloromethane is classified as a possible human carcinogen.
Systems with a TTHM (Total Trihalomethanes) violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Dunedin Water System Dunedin · Pinellas County |
46,161 | 4 | 0 | |
|
Mdwasa/rex Utilities Miami · Miami-Dade County |
45,200 | 3 | 1 | |
|
Coral Springs Improvement Dist Coral Springs · Broward County |
40,000 | 3 | 1 | |
|
Hallandale Beach, City of Hallandale Beach · Broward County |
40,000 | 6 | 4 | |
|
Clermont East Water System (2 Wps) Clermont · Lake County |
39,279 | 1 | 0 | |
|
Southwest/polk County Utility Lakeland · Polk County |
39,209 | 3 | 2 | |
|
Oakland Park City of Oakland Park · Broward County |
38,905 | 4 | 3 | |
|
North Springs Improvement District Coral Springs · Broward County |
37,371 | 4 | 0 | |
|
Vero Beach, City of Vero Beach · Indian River County |
37,308 | 5 | 0 | |
|
North Lauderdale, City of North Lauderdale · Broward County |
35,709 | 4 | 3 | |
|
Cooper City Cooper City · Broward County |
33,752 | 4 | 0 | |
|
New Port Richey Water Dept New Port Richey · Pasco County |
33,000 | 2 | 0 | |
|
Seven Springs New Port Richey · Pasco County |
32,834 | 3 | 1 | |
|
Seminole County Northwest Sanford · Seminole County |
31,986 | 1 | 0 | |
|
Marco Island Utilities (city Of) Marco Island · Collier County |
31,830 | 4 | 0 | |
|
City of Temple Terrace Utility Temple Terrace · Hillsborough County |
31,250 | 2 | 0 | |
|
West Melbourne Wtr Sys(consec) West Melbourne · Brevard County |
30,443 | 3 | 0 | |
|
Dania Beach, City of Dania Beach · Broward County |
30,000 | 6 | 1 | |
|
Fkaa Florida Keys R.o. Plants Key West · Monroe County |
30,000 | 2 | 0 | |
|
South Martin Regional Utilities Hobe Sound · Martin County |
27,000 | 5 | 0 | |
|
Davie, Town Of, #3 ; #5 Davie/hollywood · Broward County |
26,000 | 5 | 2 | |
|
Miami Intl Airport Miami · Miami-Dade County |
25,000 | 3 | 1 | |
|
Fort Walton Beach, City of Fort Walton Beach · Okaloosa County |
24,113 | 1 | 0 | |
|
Groveland Water Department Groveland · Lake County |
23,628 | 2 | 1 | |
|
N.a.s. Jacksonville Jacksonville · Duval County |
22,000 | 1 | 0 | |
|
Fernandina Beach Wtp Fernandina Beach · Nassau County |
21,925 | 2 | 0 | |
|
Minneola Water Department (2 Wps) Minneola · Lake County |
20,605 | 3 | 0 | |
|
Okeechobee Utility Authority Okeechobee · Okeechobee County |
20,000 | 5 | 1 | |
|
Avon Park, City of Avon Park · Highlands County |
19,361 | 4 | 1 | |
|
Stuart, City of Water Plant Stuart · Martin County |
16,841 | 5 | 3 | |
|
Opa Locka, City of Opa Locka · Miami-Dade County |
16,479 | 4 | 2 | |
|
Greater Pine Island Water Association St James City · Lee County |
15,725 | 2 | 0 | |
|
Dade City Water Dept Dade City · Pasco County |
15,561 | 4 | 1 | |
|
Tequesta Pws, Village of Tequesta · Palm Beach County |
15,500 | 5 | 0 | |
|
Oldsmar Water System Oldsmar · Pinellas County |
14,898 | 3 | 2 | |
|
Florida City Florida City · Miami-Dade County |
13,453 | 5 | 2 | |
|
City of Palmetto Water Dept. Palmetto · Manatee County |
13,446 | 4 | 2 | |
|
Town and Country Utility Punta Gorda · Charlotte County |
13,427 | 2 | 0 | |
|
City of Holly Hill Holly Hill · Volusia County |
13,108 | 4 | 2 | |
|
Wilton Manors, City of Wilton Manors · Broward County |
12,531 | 4 | 3 | |
|
Ave Maria Utility Company, Lllp Ave Maria · Collier County |
11,982 | 5 | 2 | |
|
R.c. Willis Wtp (city of Palatka) Palatka · Putnam County |
11,900 | 7 | 2 | |
|
Port Labelle Port Labelle · Hendry County |
11,782 | 4 | 1 | |
|
Brooksville City of Brooksville · Hernando County |
11,500 | 5 | 0 | |
|
Sunrise Southwest Fort Lauderdale · Broward County |
10,750 | 4 | 1 | |
|
Clewiston, City of Clewiston · Hendry County |
9,643 | 3 | 0 | |
|
Arcadia Water Dept, City of Arcadia · DeSoto County |
8,942 | 1 | 0 | |
|
Town of Orange Park Orange Park · Clay County |
8,668 | 5 | 2 | |
|
West Miami, City of West Miami · Miami-Dade County |
8,500 | 4 | 1 | |
|
Aloha Gardens Utilities New Port Richey · Pasco County |
8,136 | 3 | 0 |
About this data
A system is counted once if any of its violations in the past three years involved TTHM (Total Trihalomethanes), including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not TTHM (Total Trihalomethanes) alone.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The Florida records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet.