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EPA SDWIS ~155K water systems EPA + UCMR5

Cryptosporidium

EPA SDWIS quarterly extract data for this analyte. Detection counts and health-based violation counts reflect the most recent federal release.

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EPA contaminant code: 3015

Total Violations
2,446
Systems Affected
202
Health-Based %
0%
Most Affected State
-

What this means

Cryptosporidium appears in EPA SDWIS with 2,446 recorded violations across 202 public water systems. Of those, 0% are classified as health-based, meaning the reading exceeded a federally enforceable Maximum Contaminant Level or a treatment-technique requirement rather than a monitoring or reporting lapse. Health-based violations are the subset that trigger formal corrective action and public notification, so the share is a useful signal of real-world exposure risk rather than paperwork drift. State-level concentration data is not consistently reported for this contaminant, so regional interpretation should lean on the system table below rather than state aggregates. Utilities listed below are ranked by cumulative violation count, so a higher rank reflects persistence in the record rather than a single spike; readers comparing systems should consider population served alongside violation count to gauge how many households were actually exposed.

Violation Type Split

Cryptosporidium violations broken down by EPA classification.

Health-based (0%) Monitoring/Reporting (100%)

Health-based violations indicate the contaminant exceeded an EPA Maximum Contaminant Level (MCL) or treatment-technique requirement; monitoring/reporting violations are procedural.

Most Affected Water Systems

System State Violations Population
Elk City Water and Sewer Assn ID 80 320
North Greene Utilities, Inc. TN 72 5,604
Metropolitano PR 71 1,077,332
Aceitunas PR 66 8,961
Mayaguez PR 53 151,555
Iola, City Of KS 48 5,343
Penuelas PR 46 17,320
Morovis Urbano PR 45 20,628
Aguas Buenas Urbano PR 45 13,016
Town of Poolesville MD 43 6,005
Cotto Laurel PR 39 13,860
Smithville Water System TN 39 7,049
Regional Villalba Toa Vaca PR 36 33,711
Lago Guajataca PR 35 11,187
Ponce Urbano PR 34 111,926
Orocovis Urbano PR 34 16,869
Yauco PR 33 35,618
Maunabo Urbano PR 33 9,310
Talladega Water and Sewer Board, City Of AL 32 20,250
Villalba Urbano PR 32 3,362
Coamo Urbano PR 31 4,592
West Robertson Water Authority TN 30 5,915
Aguadilla PR 28 123,885
Santa Isabel PR 28 3,335
Las Piedras Humacao PR 27 36,032
Quebradillas Urbano PR 26 27,458
Juncos - Ceiba Sur PR 26 36,277
Cabo Rojo PR 25 20,749
Sabana Grande PR 24 25,229
Aibonito Urbano PR 24 5,524

Drinking Water Guides

Understanding Water Quality Data

What EPA SDWIS tracks, how violations are classified, and what MCLs mean.
PFAS in Drinking Water

What forever chemicals are, EPA testing results, and 2024 standards.
Is My Water Safe?

How to assess your local water quality and when to take precautions.

Frequently Asked Questions

What is Cryptosporidium in drinking water? ▼
Cryptosporidium is a contaminant tracked by the EPA under the Safe Drinking Water Act. It has caused 2,446 violations across 202 public water systems nationwide. 0% of these violations are health-based, meaning the contaminant exceeded Maximum Contaminant Levels (MCLs) or treatment technique requirements.
How many water systems have Cryptosporidium violations? ▼
202 public water systems across the United States have at least one Cryptosporidium violation recorded in the EPA SDWIS database.
Are Cryptosporidium violations dangerous? ▼
0% of Cryptosporidium violations are health-based, meaning the contaminant level exceeded safe limits set by the EPA. Health-based violations require corrective action by the water system. Not all violations indicate immediate health risk, but they signal that water quality standards were not met.
Which state has the most Cryptosporidium violations? ▼
State-level breakdown data is not available for this contaminant.
Where does this contaminant data come from? ▼
All violation data comes from the EPA Safe Drinking Water Information System (SDWIS), which tracks compliance for all public water systems regulated under the Safe Drinking Water Act. SDWIS records violations including Maximum Contaminant Level (MCL) exceedances, treatment technique failures, and monitoring/reporting issues.

Data Sources

Contaminant violation data from the EPA Safe Drinking Water Information System (SDWIS). Violations are categorized as health-based (Maximum Contaminant Level exceedances, treatment technique failures) or monitoring/reporting violations.

Related

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

Disclaimer: This information is provided for informational purposes only and does not constitute professional advice. Data is sourced from the EPA Safe Drinking Water Information System (SDWIS). Consult a qualified professional before making decisions based on this data.

Read our methodology - how this data is sourced, computed, and verified.

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