Largo, FL: 54 Violations — 72/100 (2026)
6 ZIP codes · 5 water systems · Updated 2026-06-03
Based on current monitoring, Largo holds an above-average drinking water safety record for FL — violations are infrequent and typically minor when they do appear.
How Largo Compares
Data: EPA SDWIS Last verified: 2026-06-03
Water Quality Map: Largo, FL
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Score Distribution
Distribution of water safety grades across Largo.
Largo Water: The Quick Version
- Your city's water systems recorded 54 violations in the past 5 years.
- Average lead level: 0.0008 mg/L.
- Homes built before 1986: 75% — older plumbing may contain lead solder.
- Estimated remediation: $2,150 per household.
- CDC health risk index: 13.51 — above typical levels.
Water Systems Serving Largo
Multiple utilities divide Largo, FL's water service — 3 leading providers among 5 on the federal register.
Overview
We track water quality and home safety data for 6 ZIP codes in Largo, Florida (population ~105,903), covering 5 community water systems serving approximately 555,497 people region-wide.
6 of 6 ZIP codes (100%) have recorded EPA violations. All violations are monitoring/reporting type.
Home Safety Score
Average Home Safety Score for Largo: B (72/100)
The score combines three factors:
| Factor | What It Measures |
|---|---|
| Water Quality | EPA violations and compliance history |
| Lead Levels | 90th percentile lead concentration vs EPA action level |
| Radon Risk | EPA radon zone classification |
Water Sources
Largo water systems draw from: Groundwater, Surface water.
Lead & Copper
- Average lead level (90th percentile): 0.0008 mg/L (EPA action level: 0.015 mg/L)
- 0 ZIP codes exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 3 (Low Risk)
- Zone 1 (High): 0 ZIP codes
- Zone 2 (Moderate): 0 ZIP codes
- Zone 3 (Low): 6 ZIP codes
Top Contaminants
| Contaminant | Category | Violations | ZIPs Affected |
|---|---|---|---|
| Consumer Confidence Report Rule | Reporting | 28 | 6 |
| Haloacetic Acids (HAA5) | Disinfection Byproducts | 21 | 6 |
| Lead | Inorganic | 7 | 6 |
| Stage 1 DBP Rule | Treatment Technique | 7 | 6 |
Areas with Most Violations
| ZIP Code | Safety Score | Violations | Health-Based | System |
|---|---|---|---|---|
| 33770 | C | 9 | 0 | Pinellas County Utilities |
| 33771 | B | 9 | 0 | Pinellas County Utilities |
| 33773 | B | 9 | 0 | Pinellas County Utilities |
| 33774 | C | 9 | 0 | Pinellas County Utilities |
| 33778 | B | 9 | 0 | Pinellas County Utilities |
| 33779 | B | 9 | 0 | Pinellas County Utilities |
All ZIP Codes in Largo
- 33770 [C] — 9 violations
- 33771 [B] — 9 violations
- 33773 [B] — 9 violations
- 33774 [C] — 9 violations
- 33778 [B] — 9 violations
- 33779 [B] — 9 violations
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Lead/copper: EPA Lead and Copper Rule sampling data
- Radon: EPA Map of Radon Zones
Updated daily.
CDC Health Data for Largo
Source: CDC PLACES (County-level estimates). Water contamination can correlate with respiratory and chronic health conditions.
Compared to National Average
Vertical line = national average. ■ Above national · ■ Below national
Key Contaminants Detected in Largo
Based on EPA violation records. Check your ZIP code report for system-specific contaminant data.
How Old Is Largo's Housing Stock?
With 75% of homes built before 1986, lead solder in plumbing is a potential concern. The EPA banned lead solder in 1986, but many older homes retain original plumbing.
Source: U.S. Census Bureau American Community Survey (ACS).
Housing Age Profile
The character of Largo's housing stock is one of deep historical layering — a median build year of 1973 signals a city built largely before the plumbing era changes of 1986 and 1970. Lead-soldered copper joints and, in the oldest properties, lead service lines are commonly present in this inventory. That context shapes what individual water testing may reveal, particularly in neighborhoods where the oldest housing is concentrated.
Over half of homes in Largo were built before 1986, when lead solder was banned. Older plumbing may leach lead into drinking water, especially with corrosive water chemistry.
Source: U.S. Census Bureau ACS B25034.
Largo: Remediation Cost in Perspective
Equity impact data for Largo lands in the favorable tier — remediation claims a small slice of what properties here are worth.
Remediation costs in Largo are relatively low compared to home values. The $1,233–$3,517 estimated range is a small fraction of median property value. Home values are 21% below the Florida average.
Protecting Children from Lead in Largo
Why children are most at risk: The CDC states there is no safe level of lead exposure for children. Children under 6 absorb lead more readily than adults, and even low levels can cause developmental delays, learning difficulties, and behavioral problems.
75% — that captures the slice of Largo housing dating from before the federal ban on solder containing lead. It pairs with aggregate utility readings that either approach or cross 0.015 mg/L, the benchmark set under the EPA Lead and Copper Rule. Together, the two figures shift one-home reads into a standard household-level confirmation, particularly for families with kids. A certified lead-removal filter is available through retailer-verified channels if a kit returns results that warrant additional measures.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Climate-Related Water Risk for Largo
Substantially more flood exposure than most communities appears in Largo's NFIP record — 956 documented claims and 83% of ZIP codes in FEMA flood zones. That exposure level makes the water-quality implications of flooding an active planning consideration rather than a background one.
Largo has a significant flood history with 956 FEMA flood insurance claims on record, averaging $70,738 per claim. With 83% of ZIP codes in FEMA-designated flood zones, flood risk is a major concern for homeowners and water quality.
How flooding affects water quality: Flood events can introduce sewage, agricultural runoff, and industrial chemicals into water supplies. Even after floodwaters recede, contamination can persist in wells and aging infrastructure. Flood damage can add significantly to the estimated <strong>$2,150</strong> remediation cost per household.
Residents in flood-prone areas should consider flood insurance even outside FEMA zones — over 25% of flood claims come from low-to-moderate risk areas. After any flood event, test your water before drinking.
Source: FEMA National Flood Insurance Program (NFIP) claims data, FEMA flood zone designations.
Deep Dive Reports
Detailed analysis for Largo, FL