Hollister, OK: 1 Health Violation — 98/100 (2026)
1 ZIP code · 1 water system · Updated 2026-06-03
Water utilities in Hollister have maintained a consistent compliance record over recent monitoring periods — the city's above-average grade in OK reflects low violation rates and no systemic health concerns flagged in current data.
How Hollister Compares
Data: EPA SDWIS Last verified: 2026-06-03
Key Facts for Hollister Residents
- Your city's water systems recorded 4 violations in the past 5 years.
- Average lead level: 0.0015 mg/L.
- Homes built before 1986: 100% — older plumbing may contain lead solder.
- Estimated remediation: $300 per household.
- CDC health risk index: 16.08 — above typical levels.
Hollister's Water Providers
Hollister, OK draws its water from one primary utility across 1 tracked system.
Overview
We track water quality and home safety data for 1 ZIP code in Hollister, Oklahoma (population ~10), covering 1 community water system serving approximately 60 people region-wide.
1 of 1 ZIP code (100%) have recorded EPA violations. 1 health-based violation documented.
Home Safety Score
Average Home Safety Score for Hollister: A (98/100)
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
Hollister water systems draw from: Groundwater.
Lead & Copper
- Average lead level (90th percentile): 0.0015 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)
Top Contaminants
| Contaminant | Category | Violations | ZIPs Affected |
|---|---|---|---|
| Total Trihalomethanes (TTHM) | Disinfection Byproducts | 4 | 1 |
| Stage 2 DBP Rule | Treatment Technique | 4 | 1 |
Areas with Most Violations
| ZIP Code | Safety Score | Violations | Health-Based | System |
|---|---|---|---|---|
| 73551 | A | 4 | 1 | Hollister |
All ZIP Codes in Hollister
- 73551 [A] — 4 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.
Hollister Community Health Snapshot
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
What's in Hollister's Water?
Based on EPA violation records. Check your ZIP code report for system-specific contaminant data.
Hollister Infrastructure Age
With 100% 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
Viewed through the lens of construction era, Hollister is predominantly an older city — a median build year of 1945 puts most of the residential inventory in the range where pre-1986 plumbing materials were the standard.
Over half of homes in Hollister 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.
How Remediation Costs Compare in Hollister
Within the Hollister market, estimated remediation claims a small portion of typical property equity — the financial burden is proportionally low.
Remediation costs in Hollister are relatively low compared to home values. The $150–$600 estimated range is a small fraction of median property value. Home values are 48% below the Oklahoma average.
Hollister: Lead Risk & Vulnerable Populations
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.
Practically, the structural drivers in Hollister — 100% pre-rule stock and citywide monitoring at or beyond the regulatory benchmark — make an in-home draw the practical way to translate aggregate averages into the specific conditions at one address.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Deep Dive Reports
Detailed analysis for Hollister, OK