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 still unresolved. 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
Unresolved first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
City of Fort Myers Water Treatment Plant Fort Myers · Lee County |
92,219 | 3 | 2 | |
|
Town of Eatonville Eatonville · Orange County |
2,727 | 4 | 2 | |
|
Mullett Lake Water Association Geneva · Seminole County |
976 | 2 | 2 | |
|
Holiday Gardens Util INC Holiday · Pasco County |
886 | 5 | 1 | |
|
Florida's Natural Growers, Inc. Lake Wales · Polk County |
690 | 3 | 2 | |
|
Linda Lake Groves Land O' Lakes · Pasco County |
283 | 4 | 2 | |
|
Mdwasa Main System Miami · Miami-Dade County |
2,377,460 | 2 | 0 | |
|
Pinellas County Utilities Clearwater · Pinellas County |
506,353 | 4 | 0 | |
|
ST Petersburg, City of Odessa · Pinellas County |
349,979 | 4 | 0 | |
|
Manatee County Utilities Dept Bradenton · Manatee County |
347,800 | 2 | 0 | |
|
Ocud/eastern Water System (2 Wp) Orlando · Orange County |
293,374 | 1 | 0 | |
|
Lee County Utilities Fort Myers · Lee County |
282,556 | 1 | 0 | |
|
Hialeah, City of Hialeah · Miami-Dade County |
238,000 | 3 | 1 | |
|
Port ST Lucie Utilities Port St Lucie · St. Lucie County |
224,485 | 4 | 1 | |
|
Collier County Regional Wtp Naples · Collier County |
216,993 | 4 | 0 | |
|
Pcud-Pasco County Regional PWS New Port Richey · Pasco County |
214,403 | 3 | 1 | |
|
Gru Murphree Wtp Gainesville · Alachua County |
195,768 | 2 | 0 | |
|
Pembroke Pines, City of Pembroke Pines · Broward County |
187,459 | 5 | 3 | |
|
Fort Lauderdale, City of Ft Lauderdale · Broward County |
185,163 | 5 | 2 | |
|
Charlotte County Utilities Port Charlotte · Charlotte County |
173,820 | 2 | 0 | |
|
Cape Coral, City of Cape Coral · Lee County |
172,693 | 2 | 0 | |
|
Melbourne, City of Melbourne · Brevard County |
167,753 | 1 | 0 | |
|
Hollywood, City of Hollywood · Broward County |
147,566 | 5 | 2 | |
|
Hernando CO Utl-West Brooksville · Hernando County |
145,204 | 3 | 0 | |
|
Miramar (east ; West) Plants Miramar · Broward County |
137,107 | 5 | 2 | |
|
Boca Raton Wtp Boca Raton · Palm Beach County |
130,000 | 2 | 0 | |
|
Orange Park Grid Middleburg · Clay County |
127,904 | 2 | 0 | |
|
Indian River County Utilities (2 Wtps) Vero Beach · Indian River County |
126,893 | 4 | 0 | |
|
Clearwater Water System Clearwater · Pinellas County |
115,000 | 5 | 0 | |
|
Boynton Beach PWS Boynton Beach · Palm Beach County |
112,000 | 6 | 0 | |
|
Martin CO Utilities Jensen Beach · Martin County |
104,105 | 3 | 1 | |
|
Miami Beach, City of Miami Beach · Miami-Dade County |
100,000 | 3 | 1 | |
|
City of Pompano Pompano Beach · Broward County |
99,400 | 3 | 1 | |
|
Seacoast Utilities Authority Palm Beach Gardens · Palm Beach County |
97,552 | 4 | 0 | |
|
Jupiter Public Water System,town of Jupiter · Palm Beach County |
94,929 | 4 | 0 | |
|
North Miami, City of North Miami · Miami-Dade County |
89,349 | 5 | 2 | |
|
Plantation, East ; Central Plantation · Broward County |
85,496 | 4 | 2 | |
|
Homestead, City of Homestead · Miami-Dade County |
80,000 | 4 | 1 | |
|
Sunrise Springtree Sunrise · Broward County |
79,550 | 4 | 1 | |
|
Sunrise Sawgrass Sunrise · Broward County |
72,400 | 4 | 2 | |
|
Delray Beach Public Water System Delray Beach · Palm Beach County |
69,754 | 3 | 1 | |
|
Tamarac (west), City of Tamarac · Broward County |
63,793 | 4 | 1 | |
|
Bradenton City of Bradenton · Manatee County |
58,584 | 2 | 0 | |
|
Lauderhill, City of Lauderhill · Broward County |
55,000 | 5 | 4 | |
|
Bcwws 2a Pompano Beach · Broward County |
54,622 | 2 | 1 | |
|
Coconut Creek, City of Coconut Creek · Broward County |
54,000 | 3 | 1 | |
|
City of Weston (indian Trace) Weston · Broward County |
52,300 | 4 | 2 | |
|
Pinellas Park Water Dept Pinellas Park · Pinellas County |
48,939 | 3 | 0 | |
|
Riviera Beach Utility District, City of Riviera Beach · Palm Beach County |
46,762 | 5 | 4 | |
|
Sebring Water ; Sewer System Sebring · Highlands County |
46,295 | 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. Retrieved from ECHO on Oct 11, 2026.