Is Seminole Improvement District water safe to drink?

Seminole Improvement District (PWS ID: FL4504903) has 370 recorded violations in the EPA SDWIS database. PFAS contamination has been detected in UCMR5 testing, with 8 PFAS compounds found. EPA SDWIS lists this system's service population as 4,993 people using Groundwater sources.

How many people does Seminole Improvement District serve?

EPA SDWIS reports that Seminole Improvement District serves 4,993 people (this public water system's service population, not the municipal population of Westlake or any other city). It is a Private-owned system using Groundwater water sources with 3,850 service connections. The operator address is listed in Westlake, Florida.

What type of violations does Seminole Improvement District have?

Seminole Improvement District has 370 total violations: 0 health-based violations (MCL exceedances or treatment failures), 369 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.

Has PFAS been detected in Seminole Improvement District water?

Yes. UCMR5 testing detected 8 PFAS compounds in Seminole Improvement District's water supply: PFPeA, PFOS, PFHxA, PFBS, PFBA, and others. PFAS are persistent "forever chemicals" that do not break down in the environment.

What water source does Seminole Improvement District use?

Seminole Improvement District uses Groundwater as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.

Where does this data come from?

All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.

Where does Seminole Improvement District sit among U.S. public water systems?

According to EPA SDWIS population_served among sitemap-advertised systems (serving 500+), Seminole Improvement District ranks #7,761 of 29,740 by people served, and #331 of 905 in Florida. Ordinals use population_served DESC among systems serving 500+ (the sitemap cohort). See /methodology#corpus-placement.

How does Seminole Improvement District's violation count compare nationally?

Seminole Improvement District has 370 recorded EPA SDWIS violations, fewer than 7% of the 29,740 public water systems serving 500 or more people nationwide (the same sitemap cohort used for the corpus-placement ranking above). 93% of that cohort has fewer violations than Seminole Improvement District. A system can have zero recorded violations and still be actively monitored, and a high violation count often reflects a system that reports thoroughly, not necessarily one with worse water.

States → Florida

Community Water System · PWS FL4504903

Seminole Improvement District

Operator location Westlake, Florida - 0% of 370 violations are health-based (lower-third health share (≤ 1%)); groundwater source; 4,993 served per SDWIS.

Compiled by PlainWater · May 15, 2026

4,993
People served (this PWS) Larger third of systems: 370
EPA violations (this PWS) Upper third of systems: 0
Health-based (this PWS) Lower third by health-based share: 8 PFAS
UCMR5 (this PWS) Upper third of PFAS-detected systems

Follow published updates (RSS)

Seminole Improvement District standing, high SDWIS violation third

0% of 370 recorded violations are health-based - lower-third health share (≤ 1%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 0% is lower-third health share (≤ 1%). UCMR5: upper-third PFAS panel (> 4 compounds). Population rank #7,761 of 29,740 among systems serving 500+.

The verdict

Seminole Improvement District sits in the upper third of the sitemap cohort by violation count (370), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is large (4,993; larger served population (> 3,309)), so household exposure scale sits behind the violation mix. Health-based share is only 0% - almost all of this trail is monitoring or reporting. UCMR5 detected 8 PFAS compounds (upper-third PFAS panel (> 4 compounds)).

#7,761 of 29,740
Population · /systems: #331 of 905
Population · FL: 370
Total EPA violations on record: 0%
Health-based (MCL / treatment failure)

Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.

PFAS Detected

8 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.

C-

Water Safety Score

51/100

Seminole Improvement District

Based on EPA SDWIS violation history and UCMR5 PFAS testing only, not water taste, odor, infrastructure age, or contaminants outside the federally tracked set.

Health-based violations A+

EPA SDWIS health-based violations on record (MCL, MRDL, treatment technique)

Monitoring & reporting violations F

370

Non-health SDWIS violations (monitoring, reporting, and other compliance)

PFAS contamination F

0.0110 µg/L

Highest PFAS compound level detected in UCMR5 testing

System Details

System Type: Community
Owner Type: Private
Connections: 3,850
County: Palm Beach
School/Daycare: Yes
MCL Violations: 0
Monitoring Violations: 369
Treatment Tech Violations: 0

Violation History

Contaminant violations recorded by EPA.

Contaminant	Category	Count	Latest
Lead and Copper Rule	MR	7	2018
BHC-GAMMA	MR	6	2005
Di(2-ethylhexyl) phthalate	MR	6	2005
trans-1,2-Dichloroethylene	MR	6	2005
Carbon tetrachloride	MR	6	2005
Endothall	MR	6	2005
Endrin	MR	6	2005
Hexachlorocyclopentadiene	MR	6	2005
Pentachlorophenol	MR	6	2005
Tetrachloroethylene	MR	6	2005
Benzene	MR	6	2005
Simazine	MR	6	2005
Di(2-ethylhexyl) adipate	MR	6	2005
LASSO	MR	6	2005
p-Dichlorobenzene	MR	6	2005
Carbofuran	MR	6	2005
2,4-D	MR	6	2005
1,1-Dichloroethylene	MR	6	2005
1,1,1-Trichloroethane	MR	6	2005
Styrene	MR	6	2005
Dalapon	MR	6	2005
Heptachlor	MR	6	2005
1,2-DIBROMO-3-CHLOROPROPANE	MR	6	2005
Picloram	MR	6	2005
Xylenes, Total	MR	6	2005
Trichloroethylene	MR	6	2005
1,1,2-Trichloroethane	MR	6	2005
Diquat	MR	6	2005
Atrazine	MR	6	2005
DICHLOROMETHANE	MR	6	2005

Violation Count vs. the National Corpus

Seminole Improvement District has 370 recorded EPA violations, 93% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 7% carry more. 0% of this system's own violations are health-based (0 of 370), and it ranks #7,761 of 29,740 by population served among that same cohort.

EPA violations vs. the national water-system corpus

Public water systems serving 500+ people (EPA SDWIS)

370 Higher than most more violations than 93% of 29,740 water systems

the national water-system corpus, bucketed by value

Each bar is a band; taller bars hold more water systems. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.

Source EPA SDWIS · 2026-05-15

How many violations vs. how serious, among peer systems

Seminole Improvement District plotted against 29 peer public water systems (500+ people served), by total violation count (x) and the share of those violations that are health-based (y). The crosshair sits at this sample's own median on each axis. A high violation count does not automatically mean a serious record: most monitoring and reporting violations are minor, not health-based.

30 public water systems (500+ people served), EPA SDWIS current release.

How to read this

Each dot is one public water system; the highlighted dot is Seminole Improvement District. A system to the right has more recorded violations; a system higher up has a larger share of those violations classified health-based rather than monitoring or reporting.

Rare but serious: few violations, but most of them are health-based.
Frequent, mostly paperwork: many violations, but mostly monitoring or reporting, not health-based.
Clean record: below-median on both counts, the tinted corner.

View all 30 systems as a list

City of Ballinger: 372 violations, 85% health-based
Nooksack Valley Water Association: 16 violations, 31% health-based
Montgomery Co RWD 12: 7 violations, 29% health-based
Irvin Water District #6: 11 violations, 27% health-based
Ticonderoga WD: 47 violations, 26% health-based
Pine Valley Plantation: 37 violations, 24% health-based
McLouth, City Of: 29 violations, 17% health-based
Kipling Oaks 1: 25 violations, 16% health-based
South Deerfield Water Supply District: 96 violations, 16% health-based
Sunset Ridge Water District: 82 violations, 15% health-based
Orange Water Dept: 136 violations, 14% health-based
Mount Pleasant Water Sys #1: 167 violations, 11% health-based
Lake Gibson Estates: 42 violations, 2% health-based
Benson Culinary Improvement District: 212 violations, 1% health-based
Conemaugh Twp Muni Auth: 567 violations, 1% health-based
Miccosukee Service Plaza: 0 violations, 0% health-based
Brazoria - Fort Bend Counties MUD 3: 0 violations, 0% health-based
Tanglewilde Thompson Place 600: 2 violations, 0% health-based
Center Water Co: 5 violations, 0% health-based
Spring Mills Elem School/Hvs: 9 violations, 0% health-based
Great Bend Industrial Park: 14 violations, 0% health-based
Glen Park Village: 19 violations, 0% health-based
Camp Is-Sho-Da: 22 violations, 0% health-based
Hamilton: 33 violations, 0% health-based
Town of Welaka: 54 violations, 0% health-based
Township of Blairstown Dpw: 61 violations, 0% health-based
McIntosh Water & Fire Pro Authority: 71 violations, 0% health-based
Clarkdale Municipal Water System: 114 violations, 0% health-based
Eureka Water Association: 273 violations, 0% health-based
Seminole Improvement District: 370 violations, 0% health-based (this system)

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 11 of 58 samples detected PFAS.

Contaminant	Date	Result	MRL	Status
PFBA	6/7/2023	<5.00 ppt	5.00 ppt	Not Detected
NMeFOSAA	6/7/2023	<6.00 ppt	6.00 ppt	Not Detected
HFPO-DA	6/7/2023	<5.00 ppt	5.00 ppt	Not Detected
6:2 FTS	6/7/2023	<5.00 ppt	5.00 ppt	Not Detected
4:2 FTS	6/7/2023	<3.00 ppt	3.00 ppt	Not Detected
8:2 FTS	6/7/2023	<5.00 ppt	5.00 ppt	Not Detected
PFMPA	6/7/2023	<4.00 ppt	4.00 ppt	Not Detected
NEtFOSAA	6/7/2023	<5.00 ppt	5.00 ppt	Not Detected
PFTrDA	6/7/2023	<7.00 ppt	7.00 ppt	Not Detected
PFTA	6/7/2023	<8.00 ppt	8.00 ppt	Not Detected
ADONA	6/7/2023	<3.00 ppt	3.00 ppt	Not Detected
PFPeS	6/7/2023	<4.00 ppt	4.00 ppt	Not Detected
PFHxS	6/7/2023	<3.00 ppt	3.00 ppt	Not Detected
PFEESA	6/7/2023	<3.00 ppt	3.00 ppt	Not Detected
PFMBA	6/7/2023	<3.00 ppt	3.00 ppt	Not Detected
PFHpS	6/7/2023	<3.00 ppt	3.00 ppt	Not Detected
PFHpA	6/7/2023	<3.00 ppt	3.00 ppt	Not Detected
PFPeA	6/7/2023	3.90 ppt	3.00 ppt	Detected
PFOS	6/7/2023	6.90 ppt	4.00 ppt	Detected
PFBS	6/7/2023	<3.00 ppt	3.00 ppt	Not Detected
9Cl-PF3ONS	6/7/2023	<2.00 ppt	2.00 ppt	Not Detected
PFNA	6/7/2023	<4.00 ppt	4.00 ppt	Not Detected
PFOA	6/7/2023	<4.00 ppt	4.00 ppt	Not Detected
PFDA	6/7/2023	<3.00 ppt	3.00 ppt	Not Detected
PFDoA	6/7/2023	<3.00 ppt	3.00 ppt	Not Detected
PFHxA	6/7/2023	3.10 ppt	3.00 ppt	Detected
PFUnA	6/7/2023	<2.00 ppt	2.00 ppt	Not Detected
11Cl-PF3OUdS	6/7/2023	<5.00 ppt	5.00 ppt	Not Detected
NFDHA	6/7/2023	<20.00 ppt	20.00 ppt	Not Detected
NMeFOSAA	12/6/2023	<6.00 ppt	6.00 ppt	Not Detected
NEtFOSAA	12/6/2023	<5.00 ppt	5.00 ppt	Not Detected
PFTrDA	12/6/2023	<7.00 ppt	7.00 ppt	Not Detected
PFTA	12/6/2023	<8.00 ppt	8.00 ppt	Not Detected
PFHpS	12/6/2023	<3.00 ppt	3.00 ppt	Not Detected
HFPO-DA	12/6/2023	<5.00 ppt	5.00 ppt	Not Detected
PFBS	12/6/2023	4.80 ppt	3.00 ppt	Detected
PFPeS	12/6/2023	<4.00 ppt	4.00 ppt	Not Detected
PFEESA	12/6/2023	<3.00 ppt	3.00 ppt	Not Detected
PFMBA	12/6/2023	<3.00 ppt	3.00 ppt	Not Detected
PFPeA	12/6/2023	6.60 ppt	3.00 ppt	Detected
PFMPA	12/6/2023	<4.00 ppt	4.00 ppt	Not Detected
8:2 FTS	12/6/2023	<5.00 ppt	5.00 ppt	Not Detected
4:2 FTS	12/6/2023	<3.00 ppt	3.00 ppt	Not Detected
NFDHA	12/6/2023	<20.00 ppt	20.00 ppt	Not Detected
PFBA	12/6/2023	5.50 ppt	5.00 ppt	Detected
PFHpA	12/6/2023	3.40 ppt	3.00 ppt	Detected
ADONA	12/6/2023	<3.00 ppt	3.00 ppt	Not Detected
9Cl-PF3ONS	12/6/2023	<2.00 ppt	2.00 ppt	Not Detected
11Cl-PF3OUdS	12/6/2023	<5.00 ppt	5.00 ppt	Not Detected
PFUnA	12/6/2023	<2.00 ppt	2.00 ppt	Not Detected

Health-based violations on Seminole Improvement District

0 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for FL4504903.

EPA SDWIS · PWS FL4504903 FL primacy agency

Sources: EPA SDWIS · Florida Department of Environmental Protection, Drinking Water Program

Nationwide peers

370 violations · 4,993 served: nearest cross-state SDWIS matches.

Cross-state systems with comparable violation load

Nearest cross-state community systems (500+ served) by total SDWIS violations on record.

4 peers

Cross-state systems with similar served population

Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).

4 peers

What to do with Seminole Improvement District

Use this system's EPA-reported record as a starting filter, not a final verdict.

See how every tracked system in Florida compares on the same EPA violation measures. Florida systems
Check whether PFAS was detected at this system under UCMR5 testing. PFAS guide
Find and compare another public water system by name or PWSID. Search systems

EPA SDWIS and UCMR5 figures are informational only, not a substitute for a certified lab test of your own tap water.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater

Compiled by PlainWater, Drinking Water Quality Editorial Process · May 15, 2026

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.